Bontu's Battle Fable

When Bontu's Battle Fable enters the battlefield,
put X -1/-1 counters on each creature.
Whenever a creature with a -1/-1 counter on it
dies, the controller gets a poison counter, this
ability triggers only once per turn.
Whenever a creature with a -/-1 counter on it
dies, move those counters to Bontu's Battle Fable.
At the beginning of combat each turn, u may
move all -1/-1 counters from Bontu's Battle Fable
to another creature chosen by an opponent.