kios,the ruiner of dreams

+2: create a 2/2 creature with deathtouch and "when this creature deals damage to a player destroy a creature with power 4 or less"
-3: put a -1/-1 counter on all creatures your opponent controls and they can't block until end of turn
-10: create an emblem:-nightmare creatures you control get +1/+1 and deathtouch and spiders you control get +2/+2