The Payoff
"Near-lethal mill. Mills opponent for an amount equal to Devourer's power, bounded by your library size. Typically mills 20 to 40+ cards."
Requirements
The Combo: Storyboard
1
Step 1
Cast Phyrexian Devourer and Altar of Dementia.
2
Step 2
Exile cards to build power.
3
Step 3
Sacrifice to Altar to mill opponent.