Pact Demon of Aggression

Pact — During each Endstep, lose 1 life, then if
Pact Demon of Aggression didn't attack and/or
blocked alone that turn, sacrifice it.
Pact Demon of Aggression attacks each combat
step if able.
Whenever Pact Demon of Aggression deals
combat damage to a player put a +1/+1 counter
on it.