When a Defense Position monster you control is targeted for an attack: Change that Defense Position monster to face-up Attack Position. Then, if the attacking monster is destroyed by that battle and sent to the Graveyard: Inflict damage to your opponent equal to that monster's original ATK in the Graveyard.
This is what, the third time we've been able to get Gamushara? I wouldn't be worried, we'll probably see it again in future. Card flip cards in general seem to see re-releases more often than most. Funnily enough, though, I got 3 copies of Gamushara on a 10-lot towards the end, lol. WTF are the odds?
this plus cat ear tribe late game when they spent so much time summoning a strong monster
when there are events that add cards to the card trader like bakura and marik this card is usually amongst them. i have 2 and looking forward to get a 3rd
This works great with something like Mirror Wall as a double-layered trap. Normally if you leave your lower ATK monster in attack position with a set trap the opponent will know what you're up to but if you switch to defense position you can spring both traps on him when he inevitably attacks.
Alternatively, he summons a weaker monster to attack your defense position monster and you Gamushara and destroy the weaker one first, then he'll attack with the stronger one and you Mirror Wall it.
I'd say it works best with decks that have numerous high attack monsters. For instance, a peak performance deck running Sonic Duck, Vanguard etc. Rising energy works well with this deck because you can activate Gamushara then equip Rising Energy once your card flips over (I think), could be dealing 4000 damage that way.