Xolatoyac, the Smiling Flood

Whenever Xolatoyac, the Smiling Flood enters
the battlefield or attacks, put a flood counter on
target land. That land is an Island in addition to
its other types for as long as it has a flood counter
on it.
At the beginning of your end step, untap each permanent you control with a counter on it.
"A dim-witted Pokemon. It doesn’t care if it bumps
its head into boats or rocks while swimming."