Gate to Phyrexia [Antiquities]Set: Antiquities Type: Enchantment Rarity: Uncommon Cost: {B}{B} Sacrifice a creature: Destroy target artifact. Activate only during your upkeep and only once each turn. "The warm rain of grease on my face immediately made it clear I had entered Phyrexia." Jarsyl, *Diary*

{T}: Add one mana of any color

Here is just some of what you can expect:

Set: World Championships 2013 Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

Set: XY: Black Star Promos Type: Dragon Rarity: Promo Retreat cost: 2

" —*Tao Tê Ching 46*

Set: POP Series 4 Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Expedition: Base Set Type: Colorless Rarity: Holo Rare

If both targets are still legal as this ability resolves

Set: Sun & Moon: Unified Minds Type: Energy Rarity: Secret Rare

Set: Sword & Shield: Shining Fates Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

Set: Neo Destiny Unlimited Type: Grass Rarity: Rare

if Nether Shadow is in your graveyard with three or more creature cards above it