Sylvan Offering + Aggravated Assault + Earthcraft

Sylvan Offering
Aggravated Assault
Earthcraft

Requires
Sylvan Offering must be in hand. Aggravated Assault must be on the battlefield. Earthcraft must be on the battlefield. You control a basic Mountain. Mana needed: 5g
Steps
  1. Cast Sylvan Offering by paying 5g, causing you and an opponent to create a 5/5 Treefolk creature token and five 1/1 Elf Warrior creature tokens.
  2. Activate Earthcraft by tapping the Treefolk token, untapping a basic Mountain you control.
  3. Activate the Mountain by tapping it, adding r.
  4. Repeat from step 2 five additional times, tapping the Elf Warrior tokens instead.
  5. Activate Aggravated Assault by paying 3rr, untapping all creatures you control and giving you an extra combat and main phase after this one.
  6. Repeat from step 2.
Results
Infinite combat phases. Infinite mana basic lands you control can produce. Infinite untap of creatures you control.

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