The fact that you have to wait three turns before it resolves
This includes choices about what spells to cast or what abilities to activate, as well as any decisions called for by triggered abilities or for any other reason
You can make a 4/4 Elemental creature token, you can pump your whole board by putting a +1/+1 counter on each creature you control, or you can scry 2 cards and then draw one
Shadows Over Innistrad's Sorcery has gained space on Pioneer recently, and if there are archetypes with green that benefit from Battles (such as Abzan Greasefang), it is likely to become a staple once again
Court of Emebreth might be the weakest if you arent the monarch since you only get a token, though it is a knight
KAPOW!" Talking with James Arnold, the graphic designer who helped build out the showcase frames, he hit on how, philosophically, the big idea behind the alternate-art mutant frames was to really push the idea of that larger-than-life mentality