Maelstrom Nexus ARB-130/5075 (The List Reprints)

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 - $3.39
LP - $2.71
MP - $2.00
HP - $2.00
DMG - $2.00