Activate Experiment Kraj using Incubation Druid's ability by tapping it, adding {G/U}{G/U}{G/U}.
Activate Experiment Kraj using Gilder Bairn's ability by paying {2}{G/U} and untapping it, doubling each counter on target permanent.
Repeat.

Infinite proliferate

Experiment Kraj

Gilder Bairn

Incubation Druid

Use any of the listed land animators to turn a land that can produce {G} or {U} into a land creature and put at least one +1/+1 counter on it.
Activate Experiment Kraj using that land's ability by tapping it, adding {G/U}.
Activate Experiment Kraj using Gilder Bairn's ability by paying {G/U} and untapping it, doubling the counters on target permanent.
Repeat from step 2.

Infinite proliferate for permanents

Card that Makes a Land Creature with a +1/+1 Counter

Biomancer's Familiar

Activate Mimeoplasm by paying {2}, causing it to become a copy of Kami of Whispered Hopes.
Activate Mimeoplasm by tapping it, adding at least seven {G/U}.
Activate Mimeoplasm by paying {2}, causing it to become a copy of Gilder Bairn.
Activate Mimeoplasm using Gilder Bairn's ability by paying {2}{G/U} and untapping it.
Repeat.

Infinite colored mana

Mimeoplasm, Revered One

Kami of Whispered Hopes

Activate Gilder Bairn by tapping it, adding {G/U} that can only be spent to activate abilities.
Activate Gilder Bairn by paying {G/U} and untapping it, doubling each counter on target permanent.
Repeat.

Tazri, Stalwart Survivor

Activate Volrath by paying {1}, causing Volrath to become a copy of Viridan Joiner until your next turn.
Activate Volrath by tapping it, adding at least seven {G}.
Activate Volrath by paying {1}, causing Volrath to become a copy of Glider Bairn until end of turn.
Activate Volrath by paying {2}{G/U} and untapping it, proliferating all the counters on target permanent.
Repeat from step 2.

Infinite green mana

Volrath, the Shapestealer

Viridian Joiner

Activate Gilder Bairn by tapping it, adding {G/U}.
Activate Gilder Bairn by paying {G/U} and untapping it, doubling each counter on target permanent.
Repeat.

Cryptolith Rite

Activate Gilder Bairn by tapping it, adding {G/U}.
Activate Gilder Bairn by paying {2}{G/U} and untapping it, doubling each counter on Crystalline Crawler.
Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding {2}.
Repeat.
Once you have infinite +1/+1 counters on Crystalline Crawler, you may instead double the counters on any other permanent(s).

Infinite +1/+1 counters on a creature

Crystalline Crawler

Activate Volrath by paying {1}, causing Volrath to become a copy of Marwyn until your next turn.
Activate Volrath by tapping it, adding at least seven {G}.
Activate Volrath by paying {1}, causing Volrath to become a copy of Glider Bairn until end of turn.
Activate Volrath by paying {2}{G/U} and untapping it, proliferating all the counters on target permanent.
Repeat from step 2.

Marwyn, the Nurturer

Sakashima of a Thousand Faces

Activate the basic land with Overgrowth attached by tapping it, adding one mana.
Overgrowth triggers, adding two additional mana.
Activate Earthcraft by tapping Gilder Bairn, untapping the basic land.
Activate Gilder Bairn by paying {2}{G/U} and untapping it, doubling the counters on target permanent.
Repeat.

Earthcraft

Overgrowth

Activate a basic Island or Forest by tapping it, adding {2}{G/U}.
Activate Earthcraft by tapping Gilder Bairn, untapping the basic land.
Activate Gilder Bairn by paying {2}{G/U} and untapping it, doubling the counters on target permanent.
Repeat.

Nyxbloom Ancient

Activate Myr Welder using Nyx Lotus's ability by tapping it, adding at least {2}{G/U}.
Activate Myr Welder using Gilder Bairn's ability by paying {2}{G/U} and untapping it, targeting any permanent.
Repeat.

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