Sheoldred's Terror [Unknown Event] Halfling Rogue Set: March of the Machine:

Set: March of the Machine: The Aftermath Type: Legendary Enchantment Creature — Human Druid Rarity: Mythic Cost: {1}{G}{W} Constellation—Whenever Calix

other Dragon spells you cast cost {1} less to cast

calculate the hypotenuse of another creature you control

you may tap two untapped creatures you control

Whenever Cavern-Hoard Dragon deals combat damage to a player

Sheoldred's Terror [Unknown Event] Halfling Rogue Set: March of the Machine:Set: Unknown Event Type: Instant Rarity: Common Cost: {B} Destroy target creature not originally printed in an Argentum expansion. (Mirrodin, Darksteel, Fifth Dawn, Scars of Mirrodin, Mirrodin Besieged, New Phyrexia, and Phyrexia: All Will be One are Argentum expansions. Argentum is Karn's original name for that plane, now you know!)