Blighted Nightmare

Enchantment

When this enchantment enters, creature cards in your graveyard perpetually get +1/+1. Blight X, Return this enchantment to its owner's hand: Return target creature card with mana value X or less from your graveyard to the battlefield. X can't be greater than the greatest toughness among creatures you control. Activate only as a sorcery.

Not legal in Commander