The Tenth Doctor, Mana Echoes, Stormchaser's Talent, and Festering March

Prerequisites

• The Tenth Doctor on the battlefield
• Mana Echoes on the battlefield
• Stormchaser's Talent on the battlefield
• Festering March in exile
• available

Steps

1. Activate The Tenth Doctor by paying , removing all time counters from Festering March
2. Festering March triggers, causing you to cast it from exile without paying its mana cost
3. Stormchaser's Talent 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 Festering March
6. Repeat

Results

• Infinite ETB
• Infinite colorless mana
• Infinite creature tokens
• Infinite magecraft triggers
• Reduce the toughness of creatures opponents control to 0
• Infinite creature tokens that are infinitely large