Polar bear

When polar bear enters the battlefield, search your
deck for an instant or sorcery card with converted
mana cost 4 or less put that card in your hand then
shuffle your deck.
{w/u}{w/u}{w/u}: Exile polar bear and return it to the battlefield on the next upkeep.
{u}{u}{u}: Polar bear gains hexproof until end of turn.
{g}{g}: Polar bear gains trample until end of turn.
"If it's black: Fight back. If it's brown: Lay down. If it's white. Goodnight. " Every Canadian ever.