Primal Prayers + Enduring Renewal + Yahenni, Undying Partisan

Primal Prayers

Enduring Renewal

Yahenni, Undying Partisan

How it works

1. Cast the creature that causes you to get energy counter(s) when it enters the battlefield by paying E due to Primal Prayers.
2. When the creature enters the battlefield, it triggers, causing you to get at least E.
3. Activate Yahenni by sacrificing the creature.
4. When the creature dies, Enduring Renewal triggers, returning the creature from your graveyard to your hand.
5. Resolve the Yahenni ability, giving it indestructible until end of turn.
6. Repeat.

This clever loop is ignited by Primal Prayers, which lets you cast qualifying low-mana creatures using energy instead of mana, effortlessly replacing that spent energy with the creature's own entry trigger. Once that creature is on the battlefield, Yahenni, Undying Partisan stands ready to sacrifice it on command, fueling infinite sacrifice triggers and protecting itself with indestructible. As soon as the creature hits the graveyard, Enduring Renewal steps in with its passive triggered ability to instantly bounce that creature right back to your hand, ready to be recast for energy once again.