Braids, Arisen Nightmare is a rare Legendary Creature — Nightmare card from Magic Online Promos (PRM), collector number 105692.
At the beginning of your end step, you may sacrifice an artifact, creature, enchantment, land, or planeswalker. If you do, each opponent may sacrifice a permanent of their choice that shares a card type with it. For each opponent who doesn't, that player loses 2 life and you draw a card.