It looks like it would increase opponent's discards, but it's your own if you lose. We'd have to be pretty confident to try it, or be using a deck that doesn't really care much about upgrades.
Basically, need:
1) Deck that can survive without 5 upgrades
2) Deck that we think is a good matchup without the ups.
If we can meet both criteria, we should use savagery. In practice, I expect very few, if any, matchups, to meet the criteria.