Every strong deck needs a power card. Today’s card is just that. Onslaught of the Fire Kings (same name as the structure deck), does everything you want a powerful card in a Fire King deck to do. First, it can summon any Fire King from your deck along with other great fire cards like Sacred Phoenix of Nephthys, Brotherhood of the Fire Fist monsters, Flamvell Firedog, Gladiator Beast Laquari, some of the Hazy Flame monsters, Manticore of Darkness, and Red Dragon Ninja.
 
As you can see, Onslaught of the Fire Kings can be used in a variety of decks, not just Fire Kings. Playing it does come with a price however. The effects of the monster brought out by Onslaught are negated and it is destroyed during the End Phase. That is really not a big deal if all you are going to use the monster for is a Xyz or Contact Fusion monster. The negative effect of Onslaught turns into a positive effect in a Fire Kings deck as Sacred Phoenix of Nephthys and the Fire Kings all get their effects when destroyed by a card effect.
 
Fire King High Avatar Garunix may be the boss monster of a fire deck, but Onslaught of the Fire Kings is the power card that speeds the deck up and makes it a deck to be reckoned with.
 
Traditional: 2/5
Advanced: 4/5

Onslaught of the Fire Kings Normal Spell Card
If your opponent controls a monster and you control no monsters: Special Summon 1 FIRE Beast, Beast-Warrior, or Winged Beast-Type monster from your Deck. Its effects are negated and it is destroyed during the End Phase. You can only activate 1 "Onslaught of the Fire Kings" per turn.

Imagine, if you will, a hybrid of two of the most influential cards in the game: Cyber Dragon and Tour Guide from the Underworld. Cyber Dragon being able to summon itself when your opponent controls a monster and Tour Guide being able to pull a specific monster out from your deck. Being able to summon a specific monster while you control none from your deck sounds very over-powered!

And it indeed is! Onslaught only allows you to access any Fire Beast,Beast-Warrior,or WInged-Beast monster from your deck while your opponent controls a monster. However, you do lose this monster at the end of the turn.

So, what are our most likely targets? Luckily, this structure deck and a large amount of Cosmic Blazer feature monsters that fit into this category, such as:

Fire-Fist Hazy Flame High Avatar
While there are a couple here that you wouldn't really want to summon, keep in mind that it does allow you to set up easy xyz plays for whatever situation you need. 

The real selling point of this card is to be able to summon yesterday's card for no tribute at all! An instant 2700 attacker is pretty powerful right? Luckily it dies in the end phase.... but remember Garunix will revive himself and nuke the field after he is destroyed.

So, in a sense, this is almost like a free Dark Hole and a 2700 attacker at the cost of your battle phase. You could also do the same with Sacred Phoenix, but a heavy storm instead. This combo is incredibly powerful and can set the duel to be in your favor from one card. Heck, this card is the reason why Garunix is playable; as you can instantly summon it to wreck havok!

Advanced: 4.5
As we received more Fire Beast,Beast-Warrior,and Winged-Beast monsters; this card just gets better and better. In addition, it can easily summon two of the most powerful boss monsters that we have available for almost no cost. 

Traditional: 3.0
Instant summons are always great in a format like this! Plus, Garunix could shine in a format with this much spam.

Art: 3.5
I have always been a fan of the Phoenix lore. The blazing form of Garunix simply looks amazing. It reminds me a little bit of the Winged Dragon of Ra as well. 

Today we are looking at: Onslaught of the Fire Kings

“If your opponent controls a monster and you control no monsters: Special Summon 1 FIRE Beast, Beast-Warrior, or Winged Beast-Type monster from your Deck. Its effects are negated and it is destroyed during the End Phase. You can only activate 1 "Onslaught of the Fire Kings" per turn.”

So we have a spell card that lets you special summon any fire type beast, beast-warrior, or winged-beast type monster from your deck if your opponent controls a monster and you do not. You don’t get any on field effects (Yeah, go away bear) and it dies during the end phase. It seems pretty hamster tickling amazing to me. Seriously, the ability to set up a rank 4 play or fetch a Fire king to attack and then blow it up during the end phase to trigger its effect? Yes sir! In Fire king decks this is the card you don’t want to see because it starts the Garunix/Sacred Phoenix shenanigans. Outside of that Fire Fist use it to make a quick rank 4 (Tiger king) without breaking a sweat, and in completely random decks you can just splash it with fire monsters to effectively act as a Tour Guide style play and/or spam Garunix. And yes, I do main deck Garunix and Onslaught in my Mermail deck. It works, I don’t know why, but it does. Onslaught and Tenki have provided a serious amount of tool-boxing power to a lot of decks, and I hope that it helps create all sorts of crazy new stratagem in the near future to combat the impending doom of Spellbook decks.

Advanced: 5/5 (Free special summons? Yes please.)
Traditional: 5/5

Hey there everyone. My apologies for my absence of about 5 days of no COTD reviews but recovering from a sore throat and cold while handling my employment search is no fun.

With that said, I aim to come back with a vengeance and we will start with, in my opinion, the most influential card in the new Structure Deck, named after this card: Onslaught of the Fire Kings!

This is a Normal Spell card with a very powerful effect, capable of being ran at 3 and being the focus point of any deck that runs it. Here's the effect.

"If your opponent controls a monster and you control no monsters: Special Summon 1 FIRE Beast, Beast-Warrior, or Winged Beast-Type monster from your Deck. Its effects are negated and it is destroyed during the End Phase. You can only activate 1 "Onslaught of the Fire Kings" per turn."

First of all, this card works like Cyber Dragon does. Your opponent needs a monster on their field while your field remains empty. Not difficult to do in this format.

By doing so and activating this card, you can Special Summon a FIRE Beast, Beast-Warrior, or Winged Beast straight from your Deck. As with yesterday's COTD Review, this can bring out the High Avatar of the Fire Kings himself, Garudix, straight from your deck, clocking at a massive 2700 ATK. You can also still Normal Summon as well during the turn you activate this so you can drop another monster to apply even more pressure.

Given that the Attribute being summoned is set to FIRE but there is 3 different types you can summon with this card with no level or ATK restriction can open the floodgates to almost anything possible. Beast-Warrior means you have access to all of the Fire Kings monsters, Garudix, and the remaining Fire King Avatars, including Yaksha. Beasts gives you access to the Enthusiastic Beast King Bearman and Wolfberk, the former helping you to make Rank 8 Xyz while the latter is basically a Junk Synchron for Rank 4 Xyz. It also gives you access to Flamvell Firedog as well if you ever want to set up Rekindling plays later. Winged-Beasts gives you access to the old-school Sacred Phoenix of Nephthys which also clocks at 2400 ATK.

Unfortunately, its effects is negated so why bother bringing out the Sacred Phoenix when Garudix is almost always better due to higher ATK? Well, case-in-point, the monster summoned by this card does get destroyed during the End Phase. This does trigger Garudix's and Sacred Phoenix's effects, allowing them to return to the field while clearing out Monsters and Spell/Traps, respectively. This also works well with Bearman, letting it get destroyed so you can Call of the Haunted back with its effect and ATK fully intact. The Fire King Avatars don't mind being destroyed since it will trigger their effects.

As you can see, there is a lot to gain off of it. It is a powerful, speedy Spell that gives you the ability to apply pressure, set up future plays, and even gives you the power to turbo Xyz as well while making other cards live and ready for use.

This card alone is worth buying 3 Structure Decks. I'm sure it will be a key card to keep watch on in the near future.

Traditional Format: 2/5 (It's not bad in that format but the restrictions hurt.)
Advanced Format: 4/5 (This card is very destructive. Watch out for this deck.)

Onslaught of the Fire Kings is a normal spell card from the newest structure deck, but you already knew that. It allows you, if your opponent controls a monster and you don't, to special summon 1 FIRE Beast, Beast-Warrior or Winged-Beast monster from your deck. Its effects are negated and is destroyed during the end phase. You can only activate 1 Onslaught of the Fire Kings once per turn. Fire Kings get something to move them along even faster, while Fire Fist gets a new toy to play with. Im sure someone will make a King of the Fire Fist hybrid deck because that is how good this card is. It even lets you attack with whatever you summon and there is no level restriction to this card either. This card alone makes me wanna build that hybrid deck. If you are using either Fire Fist or King (or both) This card is a must.
 
Traditional: 2.5
Advanced: 3.5