Beyond the one-round use for instantly drawing when we defeated an ennemy, this upgrade :
1) is a virtual stock of cards / resources and a future extended hand-size for one or several players, in a Cyclops + Field Commander archetype with low minions (in conjunction with Practiced Defense or stun effects, or nothing) : the player who will need some resources or new cards to spend them, could be interested in defeating the ennemy with that upgrade.
2) gives a "free" target for Optic Blast + Ruby Quartz Visor's Cyclops, and defeating an ennemy without spending an exhausting opportunity.
3) triggers an Interrupt effect that potentially takes a timing advantage on a villain in some scenarios, between one villain stage and another.