Muldrotha, the Gravetide + Displacer Kitten + Umbral Collar Zealot + Cloud Key

Muldrotha, the Gravetide

Displacer Kitten

Umbral Collar Zealot

Cloud Key

How it works

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

This ingenious loop turns Muldrotha, the Gravetide's graveyard-playing prowess into a relentless engine by leveraging Cloud Key (named for artifacts) to make a cheap artifact cost zero to cast repeatedly. Every time you deploy that zero-mana artifact, Displacer Kitten's trigger blinks Muldrotha to seamlessly reset your permissions, while Umbral Collar Zealot stands ready to sacrifice the artifact back into the graveyard so it can be cast all over again.