Maelstrom Wanderer is a mythic Legendary Creature — Elemental card from Eternal Masters (EMA), collector number 204. Current market price: $1.50 (foil $6.22), 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.)