Furnace of Horrors

At the beginning of each player's upkeep,
that player chooses one:
-Sacrifice a permanent
-Put the top 3 cards of the library into their graveyard
-Exile a card from their hand
The furnace eats, and eats, and eats, and eats,
and eats...
...and eats and eats and eats and eats and eats