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 .
Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.
You may have Vesuvan Doppelganger enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability."
You may play any number of lands on each of your turns.Whenever you play a land, if it wasn't the first land you played this turn, Fastbond deals 1 damage to you.
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.