Dualcaster Mage [Commander 2014]Set: Commander 2014 Type: Creature Human Wizard Rarity: Rare Cost: {1}{R}{R} Flash When Dualcaster Mage enters the battlefield, copy target instant or sorcery spell. You may choose new targets for the copy. "It has been my experience that disasters like to strike in pairs."

Sewer Nemesis's power and toughness are each equal to the number of cards in the chosen player's graveyard

Set: Sun & Moon: Forbidden Light Type: Item Rarity: Uncommon

Numsgil did in Blog

You may cast the copies without paying their mana costs

Set: EX: Unseen Forces Type: Water Rarity: Holo Rare Retreat cost: Colorless

Metal Rarity: Holo Rare Retreat cost: 0

you may play those cards

Set: Black & White: Plasma Blast Type: Psychic Rarity: Rare Retreat cost: Colorless

Set: EX: Ruby & Sapphire Type: Colorless Rarity: Uncommon Retreat cost: Colorless

At the beginning of each player's upkeep

Set: HeartGold & SoulSilver: Triumphant Type: Colorless Rarity: Common Retreat cost: Colorless

{1}{R}: Target artifact creature gets +1/+0 until end of turn