Muldrotha, the Gravetide + Displacer Kitten + Sol Ring + Phantom Train

Muldrotha, the Gravetide

Displacer Kitten

Sol Ring

Phantom Train

How it works

1. Activate Sol Ring by tapping it, adding CC.
2. Activate Phantom Train by sacrificing Sol Ring
3. Cast Sol Ring from your graveyard by paying 1.
4. Displacer Kitten triggers, blinking Muldrotha.
5. Repeat.

This loop is a masterclass in recycling your resources, turning Muldrotha, the Gravetide into an engine that lets you recast artifacts directly from your graveyard turn after turn. By tapping Sol Ring for mana, you fuel the ability of Phantom Train to sacrifice that very same Sol Ring, simultaneously growing the Train with a +1/+1 counter while feeding it to its own cost. Whenever you cast the Sol Ring again from your graveyard, Displacer Kitten triggers off the noncreature spell to blink Muldrotha, resetting the graveyard permission so you can do it all over again.