Creature of the Black Lagoon

Swampwalk, islandwalk
Whenever Creature of the Black Lagoon deals
combat damage to a player, look at the top three
cards of that player's library. Choose a nonland
card from among them and exile it. You may cast
that card for as long as it remains exiled, and you
may spend mana as though it were mana of any
color to cast that spell.
"Beware the bogs.."