Gilder Bairn + Cryptic Trilobite + Earthcraft

Gilder Bairn

Cryptic Trilobite

Earthcraft

How it works

1. Activate a basic Forest or Island by tapping it, adding G/U.
2. Activate Earthcraft by tapping Gilder Bairn, untapping the basic Forest or Island.
3. Activate the Forest or Island by tapping it, adding G/U.
4. Activate Gilder Bairn by paying 2G/U and untapping it, doubling each counter on Cryptic Trilobite.
5. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding CC that can only be spent to activate abilities.
6. Repeat from step 2.
7. Once you have infinite +1/+1 counters on Cryptic Trilobite, you may instead double the counters on any other permanent(s).

This clever engine turns exponential growth into an unstoppable loop by marrying Cryptic Trilobite’s self-sustaining counter-to-mana conversion with Gilder Bairn's unique counter-doubling ability. Because Gilder Bairn's untap symbol requires an activation cost that demands both generic and color-matching mana, Earthcraft steps in to effortlessly fuel those payments by letting your creatures tap to untap your basic lands for free. With Cryptic Trilobite pumping out restriction-bound colorless mana to help foot the bill, every iteration scales the number of counters higher and higher until you have boundless power to double anything else on your board.