B: Endling gains menace until end of turn.
B: Endling gains deathtouch until end of turn.
B: Endling gains undying until end of turn. (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
1: Endling gets +1/-1 or -1/+1 until end of turn.