Uamhas, Soul Devourer

Flying, Deathtouch, Ward {5}
Whenever Uamhas deals combat damage to a
player search that player's library for a creature
card and exile it with a soul counter.
At the begin of you upkeep you may pay X where
X is the number of cards in exile with soul
counters on them if you do put token
copies of them into the battlefield under your
control.