Nim Deathmantle + Ashnod's Altar + Ogre Chitterlord

Nim Deathmantle

Ashnod's Altar

Ogre Chitterlord

How it works

1. Activate Ashnod's Altar by sacrificing Ogre Chitterlord, adding CC.
2. When Ogre Chitterlord dies, Nim Deathmantle triggers, causing you to pay 4 to return Ogre Chitterlord from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. When Ogre Chitterlord enters the battlefield, it triggers, creating two 1/1 Rat creature tokens and giving Rats you control +2/+0 until end of turn if you control five or more Rats.
4. Activate Ashnod's Altar by sacrificing the Rat, adding CC.
5. Repeat.

This ingenious loop relies on a clever bridge between mana generation and resurrection: Ashnod's Altar converts your creatures into raw colorless mana, which then conveniently pays for the revival trigger provided by Nim Deathmantle. When you feed Ogre Chitterlord to the Altar, its death triggers the Deathmantle's ability, allowing you to use that generated mana (plus a little extra) to bring the Ogre right back to the battlefield. Because Ogre Chitterlord immediately spawns a pair of 1/1 Rat creature tokens upon its return, you not only sustain the loop by having extra fodder to sacrifice to Ashnod's Altar, but you also amass an overwhelming swarm of boosted attackers.