Arcane Reaper

Each turn, you may untap a land you control. You still have its mana. You may tap it again.
You gain {x} life as Arcane Reaper enters the battlefield, and opponents lose {x} life. Create {x} 6/6 black arcana Arcane Horrors.
This card gains +1/+1 for each arcana card and for every four lands.
“We’re inside the gates. If you see a glint of blue, leap at it. At least give us a chance to run.” Obsus Deich