MTG >Combos >Metallic Mimic +Altar of Dementia +Putrid Goblin +

Sacrifice

Putrid Goblin

with

Altar of Dementia

while

Metallic Mimic

is on the battlefield.

Putrid Goblin

will come back to the battlefield since he has persist, he will gain a -1/-1 counter and a +1/+1 counter, nullying each other.

Altar of Dementia

will mill your opponent. Keep doing it.