Springheart Nantuko + Mutable Explorer + Nissa, Resurgent Animist + Elspeth, Storm Slayer

Springheart Nantuko

Mutable Explorer

Nissa, Resurgent Animist

Elspeth, Storm Slayer

How it works

1. Play a land.
2. When the land enters, Springheart Nantuko triggers, causing you to pay 1 to create two token copies of Mutable Explorer.
3. When the Mutable Explorer tokens enter, they trigger.
4. Resolve the first Mutable Explorer trigger, creating two Mutavault land tokens that enters tapped.
5. When the Mutavault tokens enter, Springheart Nantuko and Nissa each trigger twice.
6. Resolve the Nissa triggers, adding 1.
7. Resolve the Springheart Nantuko trigger, causing you to pay 1 to create two token copies of Mutable Explorer.
8. Repeat from step 3.

This brilliant loop is supercharged by Elspeth, Storm Slayer, whose static replacement ability doubles every single token you create into a torrent of extra permanents. By playing a land, you trigger Springheart Nantuko to bestow its copying power upon Mutable Explorer, flooding the board with changeling tokens. Each arriving Mutable Explorer immediately generates tapped Mutavault tokens, which in turn feed Nissa, Resurgent Animist's landfall mana-generation to sustain the loop's continuous {1}{G} costs while building an overwhelming army.