User blog comment:LivesByProxy/Heir To Blackblade: Fulfilling League's Thief Fantasy/@comment-26424623-20160413210224/@comment-1330314-20160420211625

Variation and situational synergy are good things, I agree, but by variance I mean that the above system for catching spells might end up turning the thing into a coin flip in heated fights, where you're not sure to steal the right spell and thus end up with a lot of randomness instead of situational adaptability. You could also end up one-upping every other champion by casting their ultimates on a 25/15-second cooldown, or end up on the other side and cast stuff like or  at way too high a cooldown, so perhaps the spell steal should function in a manner that's adapted to the power (or just the cooldown) of the spell being used.