Hateflayer + Training Grounds + Jiang Yanggu, Wildcrafter

Hateflayer
Training Grounds
Jiang Yanggu, Wildcrafter

Requires
Hateflayer must be on the battlefield. Training Grounds must be on the battlefield. Jiang Yanggu, Wildcrafter must be on the battlefield. At least one +1/+1 counter on Hateflayer. Hateflayer does not have summoning sickness.
Steps
  1. Activate Hateflayer by tapping it, adding .
  2. Activate Hateflayer by paying and untapping it, causing it to deal damage equal to its power to any target.
  3. Repeat.
Results
Infinite damage.