Siltari Lancer

When Siltari Lancer enters the battlefield put the
top X cards of your library into your graveyard.
Siltari Lancer enters the battlefield with X +1/+1 counters.
Whenever a creature card is put into your
graveyard put a +1/+1 counter on target creature
you control.
Creature cards in your graveyard have Rebirth(Discard a card or sacrifice a creature, return this
card from your graveyard to the battlefield tapped.)