The Flood of Mars is a rare Creature — Alien Zombie Horror card from Doctor Who (WHO), collector number 360. Current market price: $1.15 (foil $1.82), TCGplayer market prices via Scryfall.
Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Water Always Wins — Whenever this creature attacks, put a flood counter on another target creature or land. If it's a creature, it becomes a copy of this creature. If it's a land, it becomes an Island in addition to its other types.