I lol'dWell since it uses up and strains ur heart and you burn to ashes after yeah
No its not, WTF?No you're dead.
And its Night Guy
Yes you can however it might as well be a one time use, because it requires the 8th gate.
But if the user does not die from 8th gate (like Guy now) then yes it is not as long as the user isn't a ***** and can handle the pain.
BTW I believe that Guy isn't completely useless even though he's now wheelchair bound. All he has to do is open up some gate and he'll be back to normal (gates make the user exceed limitations) and now that there's that lock on his heart, he could use the 8th gates as many times as he wants (isn't that cool?)