Blisterspit Gremlin + Sol Ring + Retraction Helix

Blisterspit Gremlin

Sol Ring

Retraction Helix

How it works

1. Cast Retraction Helix by paying , causing Blisterspit Gremlin to gain "T: Return target nonland permanent to its owner's hand" until end of turn.
2. Activate Sol Ring by tapping it, adding 2.
3. Activate Blisterspit Gremlin using its ability from Retraction Helix by tapping it, returning Sol Ring from the battlefield to your hand.
4. Cast Sol Ring by paying 1.
5. When you cast Sol Ring, Blisterspit Gremlin's last ability triggers, untapping it.
6. Sol Ring resolves.
7. Repeat from step 2.