Gribbits, Shady Slumlord

Ward—Discard a land.
When Gribbits, Shady Slumlord enters, choose a
spell type. Spells your opponents cast of the chosen
type cost an additional {p/w} or {p/b}.
At the beginning of combat on your turn you may sacrifice a land. If you do target creature gains swampwalk until end of turn.
When a land enters under an opponent's control,
you may put a land from your graveyard onto the battlefield tapped. This ability triggers only once each
turn.