With Overkill minions this can be insane. It could also be used on an Egg to let it take down small minions or simply giving it the chance to the egg to sac himself once you already abused its DR.
It´s Rush on a recently played minion, atk on 0-atk minions, windfury on minions that already attacked, and, maybe the hidden effect: hit Stealth minions (which may matter if those Spirits get abused).
With Overkill minions this can be insane. It could also be used on an Egg to let it take down small minions or simply giving it the chance to the egg to sac himself once you already abused its DR.
It´s Rush on a recently played minion, atk on 0-atk minions, windfury on minions that already attacked, and, maybe the hidden effect: hit Stealth minions (which may matter if those Spirits get abused).