Muldrotha, the Gravetide + Displacer Kitten + Megatog + Helm of Awakening

Muldrotha, the Gravetide

Displacer Kitten

Megatog

Helm of Awakening

How it works

1. Cast the artifact from your graveyard by paying 0.
2. Displacer Kitten triggers, blinking Muldrotha.
3. Activate Megatog by sacrificing the artifact.
4. Repeat.

This loop turns the graveyard into an endless engine by leveraging Muldrotha, the Gravetide's ability to repeatedly cast a cheap artifact, which is made even easier on your mana thanks to Helm of Awakening. Each time you cast that artifact, Displacer Kitten triggers to blink Muldrotha, resetting her restriction and letting you recast the artifact from the graveyard once more. Meanwhile, Megatog sits ready to sacrifice the recycled artifact to grow huge and fuel the cycle, turning a simple recursion loop into an unstoppable tide of sacrifice and enter-the-battlefield triggers.