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.
Each player sacrifices the creature they control with the highest mana value unless they pay that creature's mana cost. If two or more creatures a player controls are tied for highest, that player chooses one.
If you would draw a card, return a card from your graveyard to your hand instead. If you can't, you lose the game.If a card would be put into your graveyard from anywhere, exile that card instead.
Players play with their hands revealed.If a player would draw a card, they reveal it instead. Then any other player may pay 2 life. If a player does, put that card into its owner's graveyard. Otherwise, that player draws a card.
An opponent chooses one —• You draw three cards at the beginning of the next turn's upkeep.• You search your library for a card, put that card into your hand, then shuffle.
You may choose not to untap Amber Prison during your untap step., : Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as Amber Prison remains tapped.