Maelstrom Wanderer is a mythic Legendary Creature — Elemental card from Commander's Arsenal (CM1), collector number 11. Current market price: — (foil $9.61), 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.)