How it works
Prerequisites
- You have at least three cards in your graveyard.
Steps
- 1Activate Phyrexian Altar by sacrificing Gnawing Vermin, adding .
- 2Gnawing Vermin dies, triggering its second ability, causing target creature you don't control to get -1/-1 until end of turn.
- 3Cast Gnawing Vermin from your graveyard for its escape cost by paying and exiling three other cards from your graveyard.
- 4Gnawing Vermin enters the battlefield, triggering its first ability twice, causing you to mill four cards.
- 5Repeat.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Powerful tier?
Spellbook classifies this as Powerful — not for these brackets.