Osteo, Acheron of Bone

Reach, Vigilance, Doublestrike
{p/r}{p/r}: Osteo deals 1 damage to target creature or planeswalker.
Whenever a creature dies, if it was dealt damage
by Osteo this turn, you gain 2 life.
If Osteo would be put into a graveyard from
anywhere, instead exile it, then put it onto
the battlefield with three defender counters.
At the beginning of your end step, remove a
defender counter from Osteo.