Teferi's Wavecaster is a rare Creature — Merfolk Wizard card from Core Set 2021 (M21), collector number 327. Current market price: $0.20, TCGplayer market prices via Scryfall.
Flash When this creature enters, you may search your library and/or graveyard for a card named Teferi, Timeless Voyager, reveal it, and put it into your hand. If you search your library this way, shuffle.