River Mill

Fortified land has "{2}, {t}: Target player puts
the top two cards of their library into their graveyard. If fortified land is a island, target player puts six cards of their library into
their graveyard instead."
Fortify {2} ({2}: Attach to target land you control. Fortify only as a sorcery. This card
enters the battlefield unattached and stays on the battlefield if the land leaves.)