How it works
Prerequisites
- You have seven or more cards in your graveyard.
Steps
- 1Activate Phyrexian Altar by sacrificing Cathodion, adding .
- 2Cathodion dies, triggering itself and Decaying Soil.
- 3Resolve the Cathodion trigger, adding .
- 4Resolve the Decaying Soil trigger, causing you to pay to return Cathodion from your graveyard to your hand.
- 5Cast Cathodion by paying .
- 6Repeat.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?