The card says "Play this card when activating a monster during your turn. . . " Couldn't that be at any point during the monsters activation?
Interesting. I always figured that you activate a monster and then do stuff with it, hence "when activating a monster" is the start of that monster's activation and afterwards I figured I "have already activated it" so I couldn't play the card anymore.
However I have just found an example in the rulebook (Page 16) that supports playing the card at any point during that monsters actions. However it even uses a different wording of the card compared to the actual card.
I am confused.