Spellbinding Soprano + Sprout Swarm + Parallel Lives

Spellbinding Soprano

Sprout Swarm

Parallel Lives

How it works

1. Activate Spellbinding Soprano's encore ability by paying 3 and exiling it from your graveyard, creating a token copy of it with haste for each opponent you have.
2. Declare each Spellbinding Soprano token as an attacker.
3. Each Spellbinding Soprano token triggers, causing instant and sorcery spells you cast this turn to cost 1 less to cast for each Spellbinding Soprano token.
4. Cast Sprout Swarm with buyback by tapping a green creature and any other creature you control, creating two 1/1 Saproling creature tokens and returning Sprout Swarm to your hand.
5. Repeat step 4.

By leveraging the explosive token-doubling power of Parallel Lives, casting Spellbinding Soprano's encore ability floods the battlefield with multiple attacking token copies of herself. Each of these copies triggers upon attacking, stacking cost reductions that drive the casting cost of Sprout Swarm down to zero. Because Sprout Swarm features buyback and convoke, you can tap the very Saproling tokens it produces—whose numbers are continuously doubled by Parallel Lives—to recast the spell endlessly, looping it into an infinite storm of creature tokens and Magecraft triggers.