Activate Barrenton Medic by tapping it, creating a 1/1 Elf Warrior creature token.
The Elf Warrior enters the battlefield, triggering Kyler, putting a +1/+1 counter on itself.
Activate Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
Repeat.

Infinite creature tokens

Infinite ETB

Infinitely large creatures

Kyler, Sigardian Emissary

Presence of Gond

Barrenton Medic

Maskwood Nexus

Activate Devoted Druid by tapping it, creating a 1/1 Elf Warrior creature token.
The Elf Warrior enters the battlefield, triggering Kyler, putting a +1/+1 counter on itself.
Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
Repeat.

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