Artheil, Soul Siphon

Arthiel, Soul Sihpon gets +1/+1 for each
soul counter on it.
Whenever a tapped creature dies, put a soul
counter on Arthiel, Soul Siphon.
{10}{b}{b}: Return target creature from a
graveyard to the battlefield tapped and under
your control. This ability costs {1} less to activate
for each soul counter on Arthiel, Soul Siphon.