Skulking Killer does not consider enchantment buffs on target creature
I had a sporeback wolf with natures embrace and radiant grace on it.
It was my opponent's turn.
My wolf was 5/4 with enchantments and they cast skulking killer, which adds -2/-2 until turn's end if no other creatures are in play.
It killed my wolf.
This was during a premier draft match, Not happy.