Cheapest priced copy (Magic 2011): $0.49 at Card Kingdom, near mint, their price list as of .
Cyclops Gladiator 
Creature — Cyclops Warrior · 4/4 · Rare · Magic 2011 · #131
Whenever this creature attacks, you may have it deal damage equal to its power to target creature defending player controls. If you do, that creature deals damage equal to its power to this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2011 | 131 | Rare | $0.49 | $0.99 |
3 rulings from Wizards of the Coast
- 15 August 2010On the other hand, if Cyclops Gladiator leaves the battlefield before the ability resolves, the ability continues to resolve. Cyclops Gladiator deals damage to the targeted creature equal to the power it had as it last existed on the battlefield.
- 15 August 2010Cyclops Gladiator’s ability triggers and resolves during the declare attackers step, before blockers are declared. If it survives, it continues to attack (presumably with some damage marked on it) and may be blocked.
- 15 August 2010If the targeted creature leaves the battlefield (or otherwise becomes an illegal target) before the ability resolves, the ability doesn’t resolve. Cyclops Gladiator isn’t dealt damage.