Activate Devoted Druid by tapping it, creating a creature token.
When the token enters, Rosie triggers, putting a +1/+1 counter on Devoted Druid.
Activate Devoted Druid by putting a -1/-1 counter on it, untapping it.
Repeat.

Infinite creature ETB

Infinite creature tokens

Rosie Cotton of South Lane

Presence of Gond

Devoted Druid

Splinter Twin

Activate Barrenton Medic by tapping it, creating a creature token.
When the token enters, Rosie triggers, putting a +1/+1 counter on Barrenton Medic.
Activate Barrenton Medic by putting a -1/-1 counter on it, untapping it.
Repeat.

Barrenton Medic

Activate Devoted Druid by tapping it, creating at least one creature token.
When the token enters, Rosie triggers, putting a +1/+1 counter on Devoted Druid.
Activate Devoted Druid by putting a -1/-1 counter on it, untapping it.
Repeat.

Infinite +1/+1 counters on most creatures you control

Infinite green mana

Elemental Mastery

Activate Cinderhaze Wretch by tapping it, creating a creature token.
When the token enters, Rosie triggers, putting a +1/+1 counter on Cinderhaze Wretch.
Activate Cinderhaze Wretch by putting a -1/-1 counter on it, untapping it.
Repeat.

Cinderhaze Wretch

Activate Cinderhaze Wretch by tapping it, creating a creature token
When the token enters, Rosie triggers, putting a +1/+1 counter on Cinderhaze Wretch.
Activate Cinderhaze Wretch by putting a -1/-1 counter on it, untapping it.
Repeat.

Activate Cinderhaze Wretch by tapping it, creating at least one creature token.
When the token enters, Rosie triggers, putting a +1/+1 counter on Cinderhaze Wretch.
Activate Cinderhaze Wretch by putting a -1/-1 counter on it, untapping it.
Repeat.

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