Cayth, Famed Mechanist + Mana Echoes + Deceiver Exarch

Cayth, Famed Mechanist

Mana Echoes

Deceiver Exarch

How it works

1. Activate Cayth by paying 2 and tapping it, creating a copy of the Deceiver Exarch token.
2. When the Deceiver Exarch token enters the battlefield, it and Mana Echoes trigger.
3. Resolve the Deceiver Exarch trigger, untapping Cayth
4. Resolve the Mana Echoes trigger, adding C for each creature you control that shares a type with the Deceiver Exarch token.
5. Repeat.