Vish Kal, Blood Arbiter + Haunted One + Honor-Worn Shaku

Vish Kal, Blood Arbiter

Haunted One

Honor-Worn Shaku

How it works

1. Activate Vish Kal's second ability by removing all +1/+1 counters from it, targeting itself.
2. Holding priority, activate Honor-Worn Shaku's first ability by tapping it, adding C.
3. Activate Honor-Worn Shaku's second ability by tapping Vish Kal.
4. Vish Kal triggers, giving it and all Vampires you control +2/+0 and undying until end of turn.
5. Resolve the Honor-Worn Shaku ability, untapping it.
6. Activate Vish Kal's first ability by sacrificing it.
7. The Vish Kal abilities from step 1 and step 6 fail to resolve due to Vish Kal no longer being on the battlefield.
8. Vish Kal dies, triggering its undying ability, returning it to the battlefield with a +1/+1 counter on it.
9. Repeat.