Maelstrom Wanderer is a rare Legendary Creature — Elemental card from Commander Masters (CMM), collector number 684. Current market price: $2.36 (foil $4.02), TCGplayer market prices via Scryfall.
Creatures you control have haste. Cascade, cascade (When you cast this 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. Then do it again.)