Its not the best Rare but it is good in Bloomburrow Limited Draft and Sealed
You play a turn 1 Amulet of Vigor and then play a green bounce land on turn 2, untap it, float mana, and bounce it to its own ability to use your floating two mana to cast Summer Bloom
Avacyn, Angel of Hope (White Indestructible Creature) [c]Avacyn, Angel of Hope[/c], is incredible
Gravecrawler is flexible, flavorful, powerful and Zombie-specific, making it my personal pick for the #1 undead of all time
For this exercise, lets start by examining the mechanic that led to the tribal theme in the first place: the Mistforms (called "Mimics" in design)
Humility readily slots into decks helmed by commanders like Shorikai, Genesis Engine that can make extremely good use of its powerful effect as a way to deal with problematic enemy creatures while still having access to a functional commander and viable win conditions