Moxie, The Ravenous

Delve (You may exile any number of cards from your graveyard as you cast this spell. It costs {1} less to cast
for each card exiled this way.)
Indestructible. Moxie, The Ravenous comes into
play with X -1/-1 counters, where X is equal to
the number of cards exiled to cast Moxie, The Ravenous.
Whenever Moxie, The Ravenous deals damage to
a creature or player, put X +1/+1 counters on
Moxie, The Ravenous where X is damage dealt.
"Power is everything."