If i attack a monster with Purgatory Knights, Eval Grebe Dragon, and my opponents activate Sword Skill, Zanteisettetsu, the counterattack counts as a destruction by a card effect ?
If i attack a monster with Purgatory Knights, Eval Grebe Dragon, and my opponents activate Sword Skill, Zanteisettetsu, the counterattack counts as a destruction by a card effect ?
It counts as destruction from a monster, so yes, you will draw a card.
Purgatory Knights, Eval Grebe Dragon needs to be destroyed by a monster effect in order to activate his ability. Since Sword Skill, Zanteisettetsu grants the monster [Counterattack], the monster, using [Counterattack], will destroy Eval Grebe, allowing you to draw a card.