Tartaros, Born From Chaos

Menace, deathtouch
Whenever chaos ensues, draw a card. (Whenever something with an unknown outcome resolves.)
Whenever you attack, roll a d6. Exile cards from
the top of your library equal to the result. You may
play those cards until the end of your next turn.
Tartaros was envisaged as the opposite of the sky, an inverted-dome lying beneath the flat earth.