Explore: Cascade for lands

Explore X (When you cast this spell, exile the top card of your library until you reveal X land cards. Put those lands onto the battlefield. Put the exiled cards on the bottom of your library in any order.)

I'm making a custom land-based EDH deck, and I'm thinking of making this a keyword. It could get really over powered if X is greater than 3 or so, but usually this will be on a high cost creature with few or no other abilities.