The Tenth Doctor, Mana Echoes, Cyclical Evolution, and Ovika, Enigma Goliath

Prerequisites

• The Tenth Doctor on the battlefield
• Mana Echoes on the battlefield
• Cyclical Evolution in exile
• Ovika, Enigma Goliath 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. Ovika triggers, creating a number of creature tokens
4. When the creature tokens enter, Mana Echoes triggers, adding for each creature you control that shares a creature type with the token for each trigger
5. Resolve Cyclical Evolution
6. Repeat

Results

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