Combined "make an island" with blue-removal variant. The removal is more white than blue, but is in flavour and not much stronger than curse of chains.

...Is it meant to make it a land as well? I really hope so, because as we've been telling Vitenka over on Bandersnap, gaining land types without being lands doesn't work too well.

Assuming it is, then this is a very cool and interesting spell. Reminiscent of Utopia Vow, actually. Quite punishing removal for a fattie.