Cast Peregrine Drake by paying {4}{U}.
Donal triggers, creating a copy of the Peregrine Drake spell that is a 1/1 Spirit in addition to its other types.
The copy of Peregrine Drake enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Peregrine Drake trigger, untapping up to five lands that can tap to produce at least {3}{U}{U}.
Resolve the Cloudstone Curio trigger, returning Donal from the battlefield to your hand.
Activate five lands by tapping them, adding at least {3}{U}{U}.
Resolve the original Peregrine Drake spell from step 1.
Peregrine Drake enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Peregrine Drake trigger, untapping up to five lands that can tap to produce {3}{U}{U}.
Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand.
Cast Donal by paying {2}{U}{U}.
Donal enters the battlefield, triggering Cloudstone Curio, returning Peregrine Drake from the battlefield to your hand.
Activate five lands by tapping them, adding at least {3}{U}{U}.
Repeat.

Infinite creature tokens

Infinite ETB

Infinite LTB

Infinite mana lands you control can produce

Infinite storm count

Donal, Herald of Wings

Cloudstone Curio

Peregrine Drake

Cast Palinchron by paying {5}{U}{U}.
Donal triggers, creating a copy of the Palinchron spell that is a 1/1 Spirit in addition to its other types.
The copy of Palinchron enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Palinchron trigger, untapping up to seven lands that can tap to produce at least {4}{U}{U}.
Resolve the Cloudstone Curio trigger, returning Donal from the battlefield to your hand.
Activate seven lands by tapping them, adding at least {4}{U}{U}.
Resolve the original Palinchron spell from step 1.
Palinchron enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Palinchron trigger, untapping up to seven lands that can tap to produce {4}{U}{U}.
Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand.
Cast Donal by paying {2}{U}{U}.
Donal enters the battlefield, triggering Cloudstone Curio, returning Palinchron from the battlefield to your hand.
Activate seven lands by tapping them, adding at least {4}{U}{U}.
Repeat.

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