Whenever one or more creatures you control attack, each defending player divides all creatures without flying they control into a "left" pile and a "right" pile. Then, for each attacking creature you control, choose "left" or "right." That creature can't be blocked this combat except by creatures with flying and creatures in a pile with the chosen label.
Flying (This creature can't be blocked except by creatures with flying or reach.)Nightmare's power and toughness are each equal to the number of Swamps you control.
Mana Vault doesn't untap during your untap step.At the beginning of your upkeep, you may pay . If you do, untap Mana Vault.At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you.: Add .
Enchant creatureWhen Paralyze enters, tap enchanted creature.Enchanted creature doesn't untap during its controller's untap step.At the beginning of the upkeep of enchanted creature's controller, that player may pay . If the player does, untap the creature.
: Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That creature attacks this turn if able. Destroy it at the beginning of the next end step if it didn't attack this turn. Activate only during an opponent's turn, before attackers are declared.
