Cheapest priced copy (Magic Origins): $0.49 at Card Kingdom, near mint, their price list as of .
Mage-Ring Responder 
Artifact Creature — Golem · 7/7 · Rare · Magic Origins · #232
This creature doesn't untap during your untap step.
{7}: Untap this creature.
Whenever this creature attacks, it deals 7 damage to target creature defending player controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic Origins | 232 | Rare | $0.49 | $0.49 |
One ruling from Wizards of the Coast
- 22 June 2015The last ability triggers and resolves before blockers are declared. If the target creature is destroyed by the damage, it won’t be on the battlefield to block.