Arbok

You may sacrifice a creature named Ekans
rather than pay this spells mana cost.
Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters
the battlefield with that many +1/+1 counters on it.)
Arbok can't have -1/-1 counters placed on it.
Infect, Flanking(Whenever a creature without
flanking blocks this creature, the blocking creature
gets -1/-1 until end of turn.)
Whenever Arbok attacks or blocks, opponents' creatures get -1/-0 u