Magical Hack [Fifth Edition] 57 You can only use this

You can only use this effect of "Dream Mirror of Terror" once per turn

you must pay 500 Life Points (this is not optional)

Set: HeartGold & SoulSilver: Undaunted Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

Set: Storm of Ragnarok Card type: Synchro/Effect Monster Rarity: Super Rare Attack: 2100 Defense: 700 1 Tuner + 1 or more non-Tuner Winged Beast-Type monsters When this card is destroyed by battle and sent to the Graveyard

Exile Yawgmoth's Vile Offering

Magical Hack [Fifth Edition] 57 You can only use thisSet: Fifth Edition Type: Instant Rarity: Rare Cost: {U} Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwalk" to "plainswalk." This effect lasts indefinitely.)