Cunning
{1}{U}
Enchantment -- Aura
Enchant creature
Enchanted creature gets +3/+3.
When enchanted creature attacks or blocks, sacrifice ~this~ at the beginning of the next cleanup step.
Primal Cocoon
{G}
Enchantment -- Aura
Enchant creature
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.
When enchanted creature attacks or blocks, sacrifice ~this~.