Yore-Tiller, Unearthed

+2: Exile the top card of each player's library. You may cast cards exiled that way without paying for them. Put the rest on their owner's graveyard.
-X: Each opponent sacrifices X creatures, discards X cards, then loses X life. You gain as much life as the total of life lost that way. Draw a card.
-8: Return all creature cards from all graveyards on the battlefield under your control. They gain haste until end of turn. Exile all graveyards.