Ekans

When Ekans is declared as an attacker or a blocker, choose one.
Bite: Ekans gets +2/+0 until end of turn.
{b}: Flinch (Target beast blocking or blocked by Ekans has its power reduced to 0 until end of
turn.)
Screech: put two +0/-1 counters on target creature. If this would reduce its toughness to
less than 1, this doesn't resolve.