Mythos of the Abysswalker

Each player chooses an artifact, a creature, an enchantment, and a planeswalker from among the nonland permanents they control, then sacrifices the rest. If {b}{r} was spent to cast this spell, you choose the permanents for each player instead.

"The Abyss threatens to swallow the whole of Oolacile. Knight Artorias came to stop this, but such a hero has nary a murmur of Dark. Without doubt, he will be swallowed by the Abyss" - Elizabeth