DOOM Slayer

Vigilance,Hexproof
Upon going to your Graveyard or Exile pile,
DOOM Slayer enters the Battlefield, gains Haste,
and you get an additional Pre-Combat, Combat,
and Post-Combat step.
At the beginning of every upkeep, DOOM Slayer
loses all +1/+0 Counters and then receives {x} +1/+0 Counters, where {x} is the amount of Creatures Enemy players' control.