Nykthos, Shrine to Nyx [Theros] Black Set: Limited Edition Alpha Type:

Set: Limited Edition Alpha Type: Instant Rare Cost: {U} Change the text of target spell or permanent by replacing all instances of one basic land type with another

"Avacyn emerged from the broken Helvault

Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking

{T}: Destroy target black permanent

If you would begin your turn while Time Vault is tapped

Nykthos, Shrine to Nyx [Theros] Black Set: Limited Edition Alpha Type:Set: Theros Type: Legendary Land Rare Cost: {T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)