Felhide Spiritbinder and Fire Whip on the battlefield.
Fire Whip attached to Felhide Spiritbender.
Felhide Spiritbender does not have summoning sickness.
Creatures you control can tap to produce at least ({2} magic symbol) ({R} magic symbol) .
({2} magic symbol) ({G} magic symbol) available.
Steps
Activate Felhide Spiritbinder by tapping it, dealing 1 damage to any target.
Activate any number of creatures you control by tapping them, adding at least ({2} magic symbol) ({R} magic symbol) .
Cast Great Oak Guardian by paying ({5} magic symbol) ({G} magic symbol) .
Great Oak Guardian enters the battlefield, untapping all creatures you control and giving them +2/+2 until end of turn.
Felhide Spiritbender triggers, holding priority, activate any number of creatures you control by tapping them, adding at least ({2} magic symbol) ({R} magic symbol) .
Resolve the Felhide Spiritbender trigger, causing you to pay ({1} magic symbol) ({R} magic symbol) to create a token copy of Great Oak Guardian with haste.
The token Great Oak Guardian enters the battlefield, triggering its ability.
Holding priority, activate Felhide Spiritbinder by tapping it, dealing 1 damage to any target.
Resolve the Great Oak Guardian trigger, untapping all creatures you control and giving them +2/+2 until end of turn.
Repeat from step 5.
Results
Infinite creature tokens with haste.
Infinite damage.
Infinite ETB.
Infinitely large creatures until end of turn.
Infinite mana creatures you control can produce.
Infinite untap of creatures you control.
Infinitely large creatures you control until end of turn.