Lodon, Prince of Pain

First strike
Painborn (Each 1 life you pay while casting this spell
pays for {1}. This creature enters the battlefield with a
-1/-1 counter on it for each 1 life paid this way.)
Mutate- If this creature has a -1/-1 counter on it,
then it has power equal those counters instead
and deals in the form of -1/-1 counters. If it
would deal combat damage to a player, instead
that player puts that many cards from the top of
their library into the graveyard.