Spellbinding Soprano + Sprout Swarm + Sedgemoor Witch

Spellbinding Soprano

Sprout Swarm

Sedgemoor Witch

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.
5. Sedgemoor Witch triggers, creating a 1/1 Pest creature token.
6. Resolve Sprout Swarm, creating a 1/1 Saproling creature token and returning Sprout Swarm to your hand.
7. Repeat from step 4.

This elegant loop turns a graveyard full of music into an unstoppable swarm by leveraging cost reduction and convoke to pay for its own recurrence. Once you activate Spellbinding Soprano's encore ability and march its hasty token copies into battle, their attack triggers radically discount the cost of your instant and sorcery spells. This reduction lets you cast Sprout Swarm with buyback using fewer and fewer resources, tapping the very creatures you produce to fund the spell over and over. Meanwhile, Sedgemoor Witch watches every iteration, triggering on each cast to flood the board with Pest tokens alongside the Saprolings generated by Sprout Swarm.