Yuri, Ashen Thief

Prowl {u}{b} (You may cast this spell for its prowl cost
if you dealt combat damage to a player this turn with
a creature that shares a type with it.)
Lifelink, Yuri, Ashen Thief can't be blocked.
Each Rogue card in your hand without Prowl has
Prowl. Its Prowl cost is equal to its mana cost
reduced by {2}.