Yawgmoth, Father of Machines

While you control three or more Swamps
or three or more Artifacts, Yawgmoth has
indestructible.
{p/b}{p/b}: Target opponent sacrifices
a creature, if you paid minimum four life
to use this ability, draw a card as well.
At the beginning of your end step,
return a Artifact or Swamp from
your graveyard to your hand.