FOILCheapest priced copy (The Brothers' War Retro Artifacts): $9.49 at Card Kingdom, near mint, their price list as of .
Defense Grid 
Artifact · Rare · Ninth Edition · #293★
Each spell costs {3} more to cast except during its controller's turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
10 printings · $9.49 to $349.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eighth Edition | 296 | Rare | $11.99 | — |
| Eighth Edition | 296★ | Rare | — | $49.99 |
| Ninth Edition | 293 | Rare | $12.99 | — |
| Ninth Edition | 293★ | Rare | — | $64.99 |
| The Brothers' War Retro Artifacts | 13 | Rare | $9.49 | $11.99 |
| The Brothers' War Retro Artifacts | 76 | Rare | $9.49 | $12.99 |
| The Brothers' War Retro Artifacts | 76z | Rare | — | — |
| Kaladesh Inventions | 34 | Special | — | $199.99 |
| Urza's Legacy | 125 | Rare | $18.99 | $349.99 |
| World Championship Decks 2000 | nl125sb | Rare | $15.99 | — |
2 rulings from Wizards of the Coast
- 4 October 2004The additional cost can be reduced by effects that reduce costs, such as Sapphire Medallion.
- 1 May 2006In Two-Headed Giant, spells don't cost extra on your own turn.