The Tenth Doctor, Mana Echoes, Cyclical Evolution, and Hermes, Overseer of Elpis

Prerequisites

• The Tenth Doctor on the battlefield
• Mana Echoes on the battlefield
• Cyclical Evolution in exile
• Hermes, Overseer of Elpis on the battlefield
• available

Steps

1. Activate The Tenth Doctor by paying , removing all time counters from Cyclical Evolution
2. Cyclical Evolution triggers, causing you to cast it from exile without paying its mana cost
3. Hermes triggers, creating a creature token
4. When the creature token enters, Mana Echoes triggers, adding for each creature you control that shares a creature type with the token
5. Resolve Cyclical Evolution
6. Repeat

Results

• Infinite ETB
• Infinite colorless mana
• Infinite creature tokens
• Infinite magecraft triggers
• Infinitely large creatures you control until end of turn