Regeneration

U, T: Return target permanent you control to its owner's hand.

Prevent the next 1 damage that would be dealt to any target this turn. Draw a card.

(T: Add R.)

2, T: You gain 1 life.

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.

Flying (This creature can't be blocked except by creatures with flying or reach.)

This creature can't be blocked except by Walls and/or creatures with flying.

Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.