Maelstrom Wanderer is a rare Legendary Creature — Elemental card from Lorwyn Eclipsed Commander (ECC), collector number 127. Current market price: $0.32, 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.)