Maelstrom Nexus 159 (Commander: Dominaria United)

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.)

NM - $5.50
LP - $4.40
MP - $3.30
DMG - $2.20