Activate any permanent you control by tapping it, adding at least {1}{U}.
Cast Shrieking Drake by paying {U}.
Merrow Reejerey triggers, untapping the mana producing permanent.
Shrieking Drake enters the battlefield, returning itself from the battlefield to your hand.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite mana permanents you control can produce

Infinite storm count

Merrow Reejerey

Shrieking Drake

Maskwood Nexus

Arcane Adaptation

Activate Will by tapping it, causing white and blue spells you cast this turn to cost at least {3} less.
Activate a permanent by tapping it, adding {U}.
Cast Storm Sculptor by paying {U}.
Merrow Reejerey triggers, untapping the mana-producing permanent.
Resolve the Storm Sculptor spell.
When Storm Sculptor enters the battlefield, it triggers, returning itself from the battlefield to your hand.
Repeat from step 2.

Storm Sculptor

Will, Scion of Peace

Conspiracy

Cast Grinning Ignus by paying {2}{R}.
Merrow Reejerey triggers, untapping Twinning Glass.
Activate Grinning Ignus by paying {R} and returning it to your hand from the battlefield, adding {C}{C}{R}.
Activate Twinning Glass by paying {1} and tapping it, causing you to cast Grinning Ignus without paying its mana cost.
Repeat from step 2.

Infinite colorless mana

Grinning Ignus

Twinning Glass

Rukarumel, Biologist

Combos with "Merrow Reejerey"