I hate the words “powercreep” without context,I am going to keep saying Duelyst doesn’t have enough relevant cards for them to be worried about powercreep yet. 3 expansion from maybe but right now it might be an issue. Vet needed a range removal more than worrying about if card steps on toes some other cards.
Furthermore entropic decay is basic card and those cards aren’t design to be competitive for the life of game.They are meant for new players to have something stable to work.
At some point power creep will be issue you already can see some hints but for example Magmar doesn’t have a real usable 3 drop will any player care if CPG makes a minion that powercreeps Moloki Huntress,Primordial gazer,Thraex or Earthwalker ? Those cards aren’t being played how does placing a usable competitive card hurt game when those cards aren’t being used.Powercreep hurts the game if those 4 mention Magmar 3 drops where usable and CPG made 3 drop that made those actively usable competitive cards useless.

