Gilder Bairn has at least one +1/+1 counter on it.
You control at least one Forest or Island.
({3} magic symbol) ({U} magic symbol) available.
Steps
Activate the Forest or Island by tapping it, adding ({G} magic symbol) or ({U} magic symbol) .
Cast Clutch of Currents for its awaken cost by paying ({4} magic symbol) ({U} magic symbol) , returning a creature to its owner hand, and causing the Forest or Island to become a 0/0 Elemental creature that is still a land, and putting three +1/+1 counters on it.
Activate Experiment Kraj using the Forest or Island's ability by tapping it, adding ({GU} magic symbol) .
Activate Experiment Kraj using Gilder Bairn's ability by paying ({GU} magic symbol) and untapping it, doubling the counters on target permanent.