Dark Ritual

Phyrexian Arena

At the beginning of your upkeep, you draw a card and you lose 1 life.

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Each opponent sacrifices a creature or planeswalker with the highest mana value among creatures and planeswalkers they control.