Forum:Galaxy Tyranno Effect

Hello I had an interesting idea for use of an effect but I wanted to know if it could work.

So I control a Number 107: Galaxy-Eyes Tachyon Dragon and in my hand is a Galaxy Tyranno. My opponent then attacks my Number 107 with their monster and I activate Tyranno's effect special summoning him. Would I then be able to xyz change my Number 107 into a Number 95: Galaxy-Eyes Dark Matter Dragon using Tyranno's effect?--Eternumblaze (talk • contribs) 13:51, April 22, 2015 (UTC)