Tidal Terror is a common Creature — Octopus card from March of the Machine (MOM), collector number 82. Current market price: $0.27 (foil $0.14), TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may tap two other untapped creatures you control. If you do, this creature can't be blocked this turn. Islandcycling {2} ({2}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)