Enduring Renewal + Crimson Kobolds + Intruder Alarm + Gríma Wormtongue

Enduring Renewal

Crimson Kobolds

Intruder Alarm

Gríma Wormtongue

How it works

1. Activate Grima Wormtongue by tapping it and sacrificing Crimson Kobolds.
2. When Crimson Kobolds dies, Enduring Renewal triggers, returning Crimson Kobolds from your graveyard to your hand.
3. Resolve the Grima Wormtongue ability, causing target player to lose 1 life.
4. Cast Crimson Kobolds by paying 0.
5. Repeat.

This clever loop uses Enduring Renewal's passive ability to instantly bounce any creature sent to the graveyard straight back to your hand, neutralizing the normal cost of sacrifice. By feeding free creatures like Crimson Kobolds into Gríma Wormtongue, you can repeatedly sacrifice them to drain your opponents out of the game while simultaneously triggering Intruder Alarm for infinite untap steps. Gríma Wormtongue even ensures your opponents can't gain life to escape the onslaught, turning zero-mana casting costs into an unstoppable engine of destruction.