For control decks you want more safety and easily obtainable value
However, with Flashback in the mix this has 2-for-1 potential, and Blue mills itself enough for this to give you nice value out of the graveyard We see two mana 3/3s with Defender that can only attack when X happens in a turn, and they always end up being decent
Character-based cards like Bill run a wide gamut of offerings
Acolyte of Bahamut Acolyte of Bahamut pairs well enough with any of the four choose a background dragons, and it gives you that oh-so-desirable cost reduction for a dragon deck
While it might not be a format-defining card in Constructed, I wouldn't be surprised to see this show up in Standard decks
Heres Everything You Can Get Samut, Voice of Dissent Samut, Voice of Dissent is a five mana 3/4 with flash, double strike, vigilance, and haste that also gives other Creatures you control haste, and you can use them to tap another Creature