Blightbeetle + Yahenni, Undying Partisan + Stiltzkin, Moogle Merchant

Blightbeetle

Yahenni, Undying Partisan

Stiltzkin, Moogle Merchant

How it works

1. Donate Blightbeetle to an opponent
2. Activate Yahenni by sacrificing the undying creature.
3. When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle.
4. Resolve the Yahenni ability.
5. Repeat from step 2.

This clever loop turns Blightbeetle's passive hate into a combo engine: while its static ability normally stops opponents from growing creatures with +1/+1 counters, here it prevents your own returning creature from receiving its expected counter when it dies. By using Stiltzkin, Moogle Merchant to donate Blightbeetle across the board, you ensure your opponent's side bears the counter-suppression while you continually sacrifice your own creatures. Yahenni, Undying Partisan fuels this cycle by converting those repeated sacrifices into a growing indestructible threat while generating infinite death, entry, and leave-the-battlefield triggers.