Forum:Mysterious Triangle VS Defender, the Magical Knight

If my opponent's Defender, the Magical Knight has an A-counter on him, he still has his Spell Counter from when he was Normal summoned, I activate Mysterious Triangle to destroy him, and he removes a Spell Counter as a substitute for his Spellcaster-type monsters, can I still Special summon an Alien from my deck? Overoncloud9 20:41, March 20, 2010 (UTC)