Raganauu, Tidal Explorer

{g/u}{g/u}{g/u}{g/u}: Lands you control become Green and
Blue Elemental creatures with Hexproof, Indestructible, and power and toughness each
equal to the number of cards in your hand until
end of turn.
Whenever a Land creature you control deals
combat damage to a player, that player must reveal cards from the top of his or her library until he or
she reveals two land cards. Then they must put all
of the cards revealed this way into his or her graveyard.