Spellbinding Soprano + Sprout Swarm + Talrand, Sky Summoner

Spellbinding Soprano

Sprout Swarm

Talrand, Sky Summoner

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. Talrand's first ability triggers, creating a 2/2 Drake 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 loop relies on the cost-reduction stacking of your attacking Spellbinding Soprano tokens, which discount instant and sorcery spells by {1} for each token currently making a run at your opponents. With that massive discount in place, you can continually cast Sprout Swarm with its buyback cost covered entirely by tapping the creatures you've brought to the battlefield, creating a self-sustaining loop that continually returns the spell to your hand. As you cast Sprout Swarm over and over again, Talrand, Sky Summoner watches your spellcasting and floods the board with 2/2 Drakes to help fuel future convoke costs alongside the Saproling tokens generated by the swarm itself.