Maelstrom Nexus - 130 M ARB

The first spell you cast each turn has cascade. (When you cast your first spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

mythic
Enchantment
From the Magic: The Gathering set Alara Reborn.