Nightmare [30th Anniversary Edition] U-WTR004 and enters the battlefield with

and enters the battlefield with X +1/+1 counters on it

put two +1/+1 counters on it instead

{T}: Add X mana in any combination of colors

you may put a quest counter on Beastmaster Ascension

return up to two Rat creature cards from your graveyard to your hand

Nightmare [30th Anniversary Edition] U-WTR004 and enters the battlefield withSet: 30th Anniversary Edition Type: Creature Nightmare Horse Rarity: Rare Cost: {5}{B} 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. The Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.