Activate Incubation Druid by tapping it, adding {3}.
Activate Incubation Druid by paying {3} and untapping it, giving it +2/+2 until end of turn.
Repeat.

Infinitely large creature until end of turn

Umbral Mantle

Incubation Druid

Activate Incubation Druid's first ability by tapping it, adding three mana of any color a land you control could produce.
Leyline of Abundance triggers, adding {G}.
Activate Incubation Druid by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.
Once you have infinite {G}, you may activate Leyline of Abundance's ability to put infinite +1/+1 counters on each creature you control.

Infinite mana lands you control can produce

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinite +1/+1 counters on creatures you control

Leyline of Abundance

Activate Incubation Druid's first ability by tapping it, adding nine mana of any color a land you control could produce.
Activate Incubation Druid by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.

Nyxbloom Ancient

Activate Incubation Druid's first ability by tapping it, adding three mana of any color a land you control could produce.
Kinnan triggers, adding one mana of the color produced by Incubation Druid.
Activate Incubation Druid by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.
If you gain infinite {U} and {G} this way, you may activate Kinnan's ability an arbitraily large number of times.

Put most creature cards from your library onto the battlefield

Kinnan, Bonder Prodigy

Activate Incubation Druid's first ability by tapping it, adding six mana of any color a land you control could produce.
Activate Incubation Druid by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.

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