Cayth, Famed Mechanist + Mana Echoes + Umbral Mantle

Mana needed: {2}

URW identity

Commander legal

The 3 combo pieces

• Cayth, Famed Mechanist
• Mana Echoes
• Umbral Mantle

What must be in place

You control at least one creature token.
You control at least four creatures that share a creature type with the creature token.
Cayth does not have summoning sickness.

How to execute it

1. Activate Cayth by paying {2} and tapping it, creating a token copy of a creature token you control.
2. When the creature token enters the battlefield, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with it.
3. Activate Cayth by paying {3} and untapping it, giving it +2/+2 until end of turn.
4. Repeat.

What the combo produces

• Infinite colorless mana
• Infinite copies of creature tokens you control
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite proliferate
• Infinite untap of creatures you control
• Infinitely large creature until end of turn