Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
Tidal Terror 
Creature — Octopus · 5/6 · Common · March of the Machine · #82
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.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 82 | Common | $0.35 | $0.49 |