Cheapest priced copy (Doctor Who): $0.49 at Card Kingdom, near mint, their price list as of .
The Flood of Mars 
Creature — Alien Zombie Horror · 3/3 · Rare · Doctor Who · #360
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 45 | Rare | $0.49 | $0.79 |
| Doctor Who | 360 | Rare | $2.49 | $1.49 |
| Doctor Who | 650 | Rare | — | $5.99 |
| Doctor Who | 951 | Rare | — | $1.49 |
One ruling from Wizards of the Coast
- 13 October 2023If the target is both a creature and a land as the triggered ability resolves, it will become a copy of The Flood of Mars. Excepting some very unusual cases, that copy won't be a land, so it won't also become an Island.