Heligoland

Indestructible, creatures you control have
islandwalk and swampwalk.
U-Boat Pens: At the beginning of each
opponents upkeep, put a corpse gate counter on
target creature, that creatures controller must sacrifice it whenever they cast a spell.
Darkest Shore: At the beginning of your upkeep, create 2 Black 2/2 zombie creature tokens, if you
took damage last turn cycle Transform Heligoland