Plaguelord

Mythical (you can only have one copy of this card, in
your deck and in the battlefield)
Deathtouch
Whenever a creature would enter the battlefield,
you may put a -1/-1 counter on it, if you don't
control it then put two -1/-1 counters instead.
Creatures you control with a -1/-1 counter have deathtouch and undying.