Triton Cavalry + Leyline Immersion + Instill Energy + Leyline of Singularity

Triton Cavalry

Leyline Immersion

Instill Energy

Leyline of Singularity

How it works

1. Activate Triton Cavalry by tapping it, adding 3 that can only be spent to cast spells.
2. Cast Instill Energy by paying , targeting Triton Cavalry.
3. Triton Cavalry triggers, returning Leyline Immersion to your hand from the battlefield.
4. Activate Instill Energy by paying 0, untapping Triton Cavalry.
5. Cast Leyline Immersion by paying 3, targeting Triton Cavalry.
6. Triton Cavalry triggers, returning Instill Energy to your hand from the battlefield.
7. Repeat.