Lotus Ring + Solemnity + Tannuk, Steadfast Second

Lotus Ring

Solemnity

Tannuk, Steadfast Second

How it works

1. Activate the creature with undying by tapping and sacrificing it, adding 3.
2. When the creature dies, Solemnity triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it.
3. Activate Lotus Ring's equip ability by paying 3, attaching it to the undying creature.
4. Repeat.

This infinite loop relies on a creature with undying—such as Geralf's Messenger or Mikaeus, the Unhallowed's protection—paired with Solemnity to completely shut down the usual +1/+1 counter placement, allowing the creature to return to the battlefield indefinitely whenever it dies. Tannuk, Steadfast Second provides the necessary haste (and alternative casting options via warp), while Lotus Ring serves as the engine's catalyst; by equipping it for {3} and tapping the creature to sacrifice itself, you generate the exact mana needed to pay for Lotus Ring's equip cost over and over again. As the creature endlessly dies and enters the battlefield, you successfully churn through infinite sacrifice, leaving, and entering-the-battlefield triggers.