Forrest Best

Skulk
Carcinization - whenever you copy or gain control
of a permanent an opponent controls, exile the
top card of that player's library. You may play
that card for as long as it remains exiled.
Whenever Forrest Best deals combat damage to a player, you may gain control of target nonland permanent that player controls with mana value
X or less, where X is the amount of damage dealt
this way.