Haven't yet found this on the forum, so I apologize if it's a similar question to one from before, but my question is this: So if I activate Scion's ability by paying {2} and searching my deck for Atarka, World Render and then discarding it to make Scion a copy of it before I declare my attackers, am I allowed to activate his ability again in response to the first, thus using the stack? By this, I mean can I make him a copy of Atarka, World Render, then respond by paying {2} and searching for and discarding Shivan Dragon and then paying as much red mana as possible to make Scion a +X/+4 until end of turn, and then respond to this by paying {2} and searching for and discarding Wardscale Dragon, letting all of these resolve in order so that ultimately I have a +X/+4 double strike dragon (commander damage) that when it is attacking defending player can't cast spells? Or would this result in something completely different? If so, how could I achieve this combo, or at least most of it?
Thank you all in advance!
Any other useful combos with this idea would be helpful too!