Devastator of Magnus River

Shroud, trample
Whenever a creature an opponent controls enters
the battlefield you may put a tidal counter on it.
Whenever Devastator of Magnus River attacks,
return each permanent with a tidal counter on it
to its owner's hand.
{u}: Put a tidal counter on target creature.
{u}{u}: Put a tidal counter on target nonland
permanent.
{u}{u}{u}: Put a tidal counter on target land.