Colfenor, the Last Yew + Gutter Grime + Spawning Pit
Colfenor, the Last Yew
Gutter Grime
Spawning Pit
Infinite charge counters on a permanentInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite creature tokens that are infinitely largeInfinite death triggersInfinite storm count
How it works
Cast the creature card in your hand by paying 0.
Either that creature dies as a state-based action due to having zero toughness, or activate Spawning Pit by sacrificing that creature.
Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
Activate Spawning Pit by sacrificing the Ooze.
When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand.
If the Spawning Pit ability is not a mana ability, resolve those abilities now.