Immortal Killbot

When Immortal Killbot enters the battlefield,
put a life counter on target creature.
{w}{u}: Put a Life Counter on target creature.
If their are no life counters on any creatures,
Immortal Killbot dies. Immortal Killbot can't
die if their is a life counter on any creature.
Immortal Killbot can't have a life counter on
it. If Immortal Killbot dies, draw 2 cards.