Battlemage's Bracers + Tidewater Minion + Rofellos, Llanowar Emissary

Battlemage's Bracers

Tidewater Minion

Rofellos, Llanowar Emissary

How it works

1. Activate Rofellos by tapping it, adding at least .
2. Activate Tidewater Minion by tapping it, targeting Rofellos.
3. Battlemage's Bracers triggers, causing you to pay 1 to copy Tidewater Minion's ability, targeting Tidewater Minion.
4. Resolve both Tidewater Minion abilities, untapping it and Rofellos.
5. Repeat.

This ingenious loop transforms your green mana production into an engine of perpetual motion by letting Battlemage's Bracers double up on untap effects. When Rofellos, Llanowar Emissary taps for a massive influx of green mana, Tidewater Minion steps in to untap it, but the Bracers allow you to pay a single colorless mana to copy that untap ability targeting the Minion itself. As both creatures continually untap one another, you feed the loop with Rofellos's forest-scaling mana generation while generating infinite green mana and infinite untaps.