Tideswallower Leviathan

Hexproof
When Tideswallower Leviathan enters the battlefield, return all non-blue creatures to
their owners hands. Tideswallower Leviathan enters the battlefield with a +1/+1 counter on it for each creature that left the battlefield this way.
{3}{u}{u}{u}: Return Tideswallower Leviathan to
it's owner's hand.