Mana Echoes + Whitemane Lion + Signpost Scarecrow

Mana Echoes

Whitemane Lion

Signpost Scarecrow

How it works

1. Cast Whitemane Lion by paying 1.
2. When Whitemane Lion enters the battlefield, it triggers itself and Mana Echoes.
3. Resolve the Mana Echoes trigger, adding at least CCCC.
4. Resolve Whitemane Lion's trigger, returning itself from the battlefield to your hand.
5. Activate Signpost Scarecrow by paying 2, adding .
6. Repeat any number of times.
7. Once you have infinite colorless mana, you may activate Signpost Scarecrow any number of times.