Dennaios the Multicolored

You may cast Dennaios the Multicolored without paying his manacost
if you control five different basic land types.
{w}{u}{b}{r}{g}: Search your library for a card
with {w}{u}{b}{r}{g} in their mancost and put it
into your hand.
Sacrifice Dennaios the Multicolored if a spider
enters the battlefield.