Spellbinding Soprano + Sprout Swarm + Adrix and Nev, Twincasters

Spellbinding Soprano

Sprout Swarm

Adrix and Nev, Twincasters

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.

This elegant loop hinges on reducing the cost of Sprout Swarm until its buyback and casting requirements completely vanish. By using Spellbinding Soprano's encore ability—doubled in effectiveness when Adrix and Nev, Twincasters are on the battlefield—you stack up enough attack triggers to discount instant and sorcery spells by at least four generic mana. Once Sprout Swarm costs a mere {G} to cast, you can tap the very Saproling tokens it creates to fuel its convoke ability. Adrix and Nev, Twincasters then double the yield into two tokens per casting, leaving you with a surplus of creatures to repeat the process infinitely and flood the board.