You don't need to control the spell or ability that creates the tokens, but you do have to be the one creating the tokens for Quina's first ability to apply
It's a bad feeling when you run out of cards because it feels like youre not able to implement your strategy and the winner is whoever gets lucky enough to draw a game-swinging card first
Dies specifically means from the battlefield to the graveyard
Still, I think the upfront cost as well as the fact that you need to untap with it before you can start exiling stuff makes it a tougher sell than other options as far as graveyard hate goes
Look at each creature as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times
If this spell was cast from a graveyard, instead create X of those tokens, where X is the number of creature cards in your graveyard