How it works
Prerequisites
- Marath has at least two +1/+1 counters on it.
Steps
- 1Activate Marath by paying and removing a +1/+1 counter from it, creating a 1/1 Elemental creture token.
- 2The Elemental enters the battlefield, triggering Mana Echoes and Cathars' Crusade.
- 3Resolve the Mana Echoes trigger, adding for each Elemental you control.
- 4Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control.
- 5Repeat.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?