yugioh saikyo card battle Flag Lead Unicorn by Every-Rush-Duel-Card on DeviantArt Yu-Gi-Oh Duel Monsters - Saikyo

This has to be a political players dreamyou get to play in aggressive colors while also benefiting off creatures dying by gaining card advantage

Kytheon, Hero of Akros definitely gets the checkmark for being Standard playable, but we might not see this guy breaking down tournament walls until Courser of Kruphix and Sylvan Caryatid becomes a thing of the past

==== An excellent new Metalmorph card that is easier to use thanks to ignoring the summoning conditions of the monster that mentions Max Metalmorph so long as you tribute a monster that mentions that trap card

The answer is sort of three: artifacts, blue, and black