Chaos' Gate

You may look at the top card of your library any time.
You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its
mana value rather than pay its mana cost.

{t}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

I know everybody, here, and there. You wish to leave this place? Then, it is my wish to make your doing so a little bit more interesting... and, if you encounter the Olympians someday, do give them my regards.