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