Dandân, Devonian Cataclysm

Islandwalk

Islands you control have {t} Create {u} then sacrifice this card.
Fish you control gain +1/+1 counters equal to the number of Islands sacrificed this turn.
At the beginning of the end step, if you control no Islands, sacrifice this card, then return X Islands
from your Graveyard to the battlefield where X equals the number of +1/+1 counters that were on this card.