Activate Xavier Sal by tapping it and removing a counter from a permanent you control, creating a token copy of the Forest Dryad token.
When the Forest Dryad enters the battlefield, Intruder Alarm and Oran-Rief Hydra trigger.
Resolve the Oran-Rief Hydra trigger, putting a counter on a creature you control.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.

Infinite creature ETB

Infinite creature tokens

Infinite untap of creatures

Infinite mana creatures you control can produce

Infinite Forest tokens

Infinite landfall triggers

Infinite +1/+1 counters on a creature

Xavier Sal, Infested Captain

Intruder Alarm

Oran-Rief Hydra

Staff of Titania

Jyoti, Moag Ancient

Awaken the Woods

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