Strong stats, quality LV8 generic XYZ (one of the better ones overall).

1st effect which negates a spell can be great, especially since Pendulums (and cards used to tutor them) are Spells.  Though still vulnerable to numerous monster effects.  Will depend on your matchup but since it's an Extra Deck card, there's no draw-probability issues.

2nd effect essentially protects other monsters from battle.  Won't be doing much damage against a smart opponent.  Ancillary effect at best.

3rd effect can be practical in the instance you have an additional XYZ monster, which won't be very likely but good to have in a certain situation.

4/5

Wow what a name. Ok. Number 38: Hope Harbinger Dragon Titanic Galaxy is a Rank 8 Light Dragon-type XYZ monster with 3000 Atk and 2500 Def. Blue-Eyes White Dragon stats are killer. This one requires just 2 Level 8 monsters to XYZ Summon. So that makes it strong and generic for decks that want an easy beefy Dragon. 
 
Number 38: HHDTG (even the abbreviation is difficult) has a few effects that make it slightly different from the rest of the generic Rank 8 toolbox dragons. The first is once per turn to negate and absorb a Spell Card as an XYZ material if they activate that card or its effect. That effect on its own would make this a very good anti Pendulum option. It also makes opponent's pay the cost associated with the spell, but not gain its effect. I also love that this effect doesn't require material, so if you resurrect HHDTG, this effect is live which would make its other effects live as well. You could even negate your own spell if you really want the XYZ Material. 
The next two effects can be activated as often as you want in either player's turn. The only one that requires an XYZ Material is the one that lets you detach to switch an opponent's attack target to HHDTG. You can divert any monster to this card and then pump it with Honest, but the play is somewhat obvious. The last effect is to watch as a different XYZ monster is destroyed by battle or effect and then gain its original attack as a bonus to your own XYZ target, probably HHDTG. You can destroy your own XYZ monster to pump a different one so long as HHDTG is still on the field. 
 
All of these effects serve a purpose, but only the first will really see play. This card really needed a grave effect for when Dark Matter sits on it and detaches. As a part of the toolbox, run 1 to out Pendulum monsters. 
 
Score: 4/5
Art: 4/5
 
-WarlockBlitz

Number 38: Hope Harbinger Dragon Titanic Galaxy

It’s absolutely amazing that such a long name can be squeezed into that little space on the card. What’s equally amazing is that I can pare down this monster’s equally long effect to something much simpler: “Once per either turn, negate a spell card.”

That’s pretty much it. The other two effects of his are unnecessary. Any effect that allows you to change the attack target to something else is just useless, because no competent player would attack under those circumstances. And the third effect is just a boosting effect that’s situational at best and will probably never be truly useful. So let’s focus on the effect that matters.

I’ve been able to see this card in action in OCG Blue-Eyes decks, and it’s pretty strong, especially against mirror decks. In fact, it’s the strongest counter to Gospel of Revival, because you negate it AND steal it, preventing it from hitting the graveyard, where it’s equally strong. I don’t know where the TCG will be at when Gospel of Revival finally does show up, but that spell card makes me want to run this monster in any deck. And I guess that’s the heart of the matter. Number 38: Hope Harbinger Dragon Titanic Galaxy is really good at what it does and doesn’t take a lot of resources to summon. It has a great future, a ton of support, and a brutal effect with literally a reverse cost, where instead of losing an xyz material, you gain one. Are you kidding me?

Good card.

Advanced: 4/5

Future Potential: 5/5