Seviper

You may cast Seviper from your graveyard if you
sacrifice a Bird, Egg, Frog, Mouse, or Rat in
addition to paying its mana cost to cast it.
Seviper can't have -1/-1 counters placed on it.
At the beginning of your upkeep you may remove
an Aura or counter attached to or on Seviper. {p/c}{b/g}: Seviper gets +1/+0 and gains infect and
flanking until end of turn. {p/c}{p/c}: Seviper gets -1/-0 and gains skulk until end
of turn. (This creat