Cause a green creature to enter the battlefield under your control.
Sylvan Anthem triggers, causing you to scry 1.
Arwen Undómiel triggers, putting a +1/+1 counter on Herd Baloth.
Herd Baloth triggers, creating a 4/4 Beast creature token.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Infinite creature tokens

Infinite ETB

Infinite scry 1

Arwen Undómiel

Sylvan Anthem

Herd Baloth

Cause a creature to enter the battlefield under your control.
Sylvan Anthem triggers, causing you to scry 1.
Elrond's first ability triggers, putting a +1/+1 counter on Herd Baloth.
Herd Baloth triggers, creating a 4/4 Beast creature token.
Repeat from step 2.

Elrond, Master of Healing

Cause a green creature to enter the battlefield under your control.
Sylvan Anthem triggers, causing you to scry 1.
Arwen Undómiel triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a 1/1 Squirrel creature token.
Repeat from step 2.

Scurry Oak

Cause a creature to enter the battlefield under your control.
Sylvan Anthem triggers, causing you to scry 1.
Elrond's first ability triggers, putting a +1/+1 counter on Scurry Oak.
Scurry Oak triggers, creating a 1/1 Squirrel creature token.
Repeat from step 2.

Activate the mana-producing creature by tapping it, adding at least {G}.
Activate Llanowar Mentor by paying {G}, tapping it and discarding a card, creating a 1/1 Llanowar Elves creature token.
The Llanowar Elves token enters the battlefield, triggering Intruder Alarm and Sylvan Anthem.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the Sylvan Anthem trigger, causing you to draw a card.
Repeat from step 2.

Combos with "Sylvan Anthem"