Assimilated Dross Pits

{t}: Add {b}. Put an oil counter on Assimilated
Dross Pits
Essence - The first time each turn:
•You draw a card other than in your draw step,
you gain 1 life.
•An opponent draws a card other than in their draw
step, they lose 1 life.
You may remove X oil counters from Assimilated
Dross Pits to return a card of X or less mana cost
from your graveyard to your hand.