Infinite ETB, Infinite colorless mana, Infinite creature tokens
Activate Cayth by paying and tapping it, creating a copy of the Deceiver Exarch token.
When the Deceiver Exarch token enters the battlefield, it and Mana Echoes trigger.
Resolve the Deceiver Exarch trigger, untapping Cayth
Resolve the Mana Echoes trigger, adding for each creature you control that shares a type with the Deceiver Exarch token.
Repeat.
Component Cards
How It Works
Activate Cayth by paying and tapping it, creating a copy of the Deceiver Exarch token.
When the Deceiver Exarch token enters the battlefield, it and Mana Echoes trigger.
Resolve the Deceiver Exarch trigger, untapping Cayth
Resolve the Mana Echoes trigger, adding for each creature you control that shares a type with the Deceiver Exarch token.
Repeat.