Kelsien, the Plague + Thornbite Staff + Mer-Ek Nightblade

Kelsien, the Plague
Thornbite Staff
Mer-Ek Nightblade

Requires
Kelsien, the Plague must be on the battlefield. Thornbite Staff must be on the battlefield. Mer-Ek Nightblade must be on the battlefield. Thornbite Staff attached to Kelsien. Kelsien has at least one +1/+1 counter on it.
Steps
  1. Activate Kelsien by tapping it, dealing 1 damage to target creature and destroying it due to Kelsien's deathtouch.
  2. The creature dies, triggering Kelsien twice.
  3. Resolve the first Kelsien trigger, causing you to get an experience counter.
  4. Resolve the second Kelsien trigger, untapping it.
  5. Repeat.
  6. You may also repeat this loop any time a creature enters the battlefield under an opponent control.
Results
Destroy any creature that enters the battlefield under an opponent's control. Destroy any number of target creature(s) opponents control.

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