The Tenth Doctor + Mana Echoes + Festering March + Saheeli, Sublime Artificer

Prerequisites

• You control at least six creatures that share a creature type with the tokens generated by Saheeli, Sublime Artificer

Steps

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

Effects

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