Activate Incubation Druid by tapping it, adding {G}{G}{G}.
Activate Instill Energy by paying {0}, untapping Incubation Druid.
Cast Frog Tongue by paying {G}, attaching it to Incubation Druid.
Frog Tongue enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Frog Tongue trigger, causing you to draw a card.
Resolve the Cloudstone Curio trigger, returning Instill Energy from the battlefield to your hand.
Cast Instill Energy by paying {G}, attaching it to Incubation Druid.
Instill Energy enters the battlefield, triggering Cloudstone Curio, returning Frog Tongue from the battlefield to your hand.
Repeat.

Infinite card draw

Infinite draw triggers

Near-infinite mana lands you control can produce

Near-infinite storm count

Incubation Druid

Cloudstone Curio

Frog Tongue

Instill Energy

Activate Incubation Druid by tapping it, adding {G}{G}{G}.
Activate Nature's Chosen by paying {0}, untapping Incubation Druid.
Cast Frog Tongue by paying {G}, attaching it to Incubation Druid.
Frog Tongue enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Frog Tongue trigger, causing you to draw a card.
Resolve the Cloudstone Curio trigger, returning Nature's Chosen from the battlefield to your hand.
Cast Nature's Chosen by paying {G}, attaching it to Incubation Druid.
Nature's Chosen enters the battlefield, triggering Cloudstone Curio, returning Frog Tongue from the battlefield to your hand.
Repeat.

Nature's Chosen

Activate Elvish Aberration by tapping it, adding {G}{G}{G}.
Activate Nature's Chosen by paying {0}, untapping Elvish Aberration.
Cast Frog Tongue by paying {G}, attaching it to Elvish Aberration.
Frog Tongue enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Frog Tongue trigger, causing you to draw a card.
Resolve the Cloudstone Curio trigger, returning Nature's Chosen from the battlefield to your hand.
Cast Nature's Chosen by paying {G}, attaching it to Elvish Aberration.
Nature's Chosen enters the battlefield, triggering Cloudstone Curio, returning Frog Tongue from the battlefield to your hand.
Repeat.

Elvish Aberration

Activate Elvish Aberration by tapping it, adding {G}{G}{G}.
Activate Instill Energy by paying {0}, untapping Elvish Aberration.
Cast Frog Tongue by paying {G}, attaching it to Elvish Aberration.
Frog Tongue enters the battlefield, triggering itself and Cloudstone Curio.
Resolve the Frog Tongue trigger, causing you to draw a card.
Resolve the Cloudstone Curio trigger, returning Instill Energy from the battlefield to your hand.
Cast Instill Energy by paying {G}, attaching it to Elvish Aberration.
Instill Energy enters the battlefield, triggering Cloudstone Curio, returning Frog Tongue from the battlefield to your hand.
Repeat.

Pay {G} to cast Nature's Chosen targeting Llanowar Tribe.
Cloudstone Curio triggers returning Frog Tongue to your hand if it's on the battlefield.
Tap Llanowar Tribe, adding {G} {G} {G}.
Activate Nature's Chosen to untap Llanowar Tribe.
Pay {G} to cast Frog Tongue, targeting Llanowar Tribe and drawing a card.
Cloudstone Curio triggers, returning Nature's Chosen to your hand.

Infinite green mana

Llanowar Tribe

Pay {G} to cast Instill Energy targeting Llanowar Tribe.
Cloudstone Curio triggers returning Frog Tongue to your hand if it's on the battlefield.
Tap Llanowar Tribe, adding {G} {G} {G}.
Activate Instill Energy to untap Llanowar Tribe.
Pay {G} to cast Frog Tongue, targeting Llanowar Tribe and drawing a card.
Cloudstone Curio triggers, returning Instill Energy to your hand.

Combos with "Frog Tongue"