Glorybringer (5/8)

The swooping terror of Amonkhet is a real monster. It’s an efficiently-costed attacker that also clears out a pesky creature en route to smashing an opponent's face. You can pick off another flier, something big and bulky on the ground, or anything but another Glorybringer or other Dragon. And if you don’t need to exert it, it’s a nice pocket threat that's still a 4/4 with haste for a reasonable price. It also synergizes well with untap effects or vigilance effects, like Always Watching.

Glorybringer is pretty powerful, all in all. It's certainly causing a big splash in Standard at the present, thanks to its efficient body and potent effect. I don't see it getting usurped anytime soon in this Standard or in the next set. Swoop early, swoop often.

Constructed: 4.75

Casual: 5

Limited: 5

Multiplayer: 3.5

Commander: 4

Glorybringer
 
The cover of the Pathfinder sourcebook Lost Kingdoms involves a mummified dragon rising from its crypt to fight some of the iconic characters. I was rather surprised Wizards of the Coast didn't include something similar in Amonkhet. It seems clear to me that if you have dragons around, they would be important enough to mummify. Perhaps Bolas doesn't want the competition, but I doubt there's any risk of any being comparing to the last Elder Dragon.
 
Regardless, Glorybringer is absolutely one of the most powerful creatures in Amonkhet. It hits insanely hard and obscenely fast (even in Standard, much less in formats with Llanowar Elves), and not untapping for a turn is hardly a drawback for a color that loves to attack and/or when it's already killed everything on the other side of the table. The only wrinkle is that as attacking goes, it occupies a similar sort of space to various of Kaladesh's vehicles; but for any deck that chooses the dragon direction, I expect this card to be downright devastating.
 
Constructed: 4/5
Casual: 4/5
Limited: 5/5
Multiplayer: 4/5
EDH/Commander: 4/5