Demon of Death's Gate
Creature — Demon
You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost.
Flying, trample
The locks on the cages of the damned are opened with keys of marrow, sinew, and blood.
Vance Kovacs
Magic 2011 (M11)
• #92Rulings
Casting Demon of Death's Gate by paying its alternative cost doesn't change its mana cost or mana value.
(wotc • 2010-08-15)
Casting Demon of Death's Gate by paying its alternative cost doesn't change when you can cast it. You can cast it only at the normal time you could cast a creature spell.
(wotc • 2010-08-15)
Effects that increase or reduce the cost to cast Demon of Death's Gate will apply to it even if you choose to pay its alternative cost.
(wotc • 2010-08-15)
Rulings
Casting Demon of Death's Gate by paying its alternative cost doesn't change its mana cost or mana value.
(wotc • 2010-08-15)
Casting Demon of Death's Gate by paying its alternative cost doesn't change when you can cast it. You can cast it only at the normal time you could cast a creature spell.
(wotc • 2010-08-15)
Effects that increase or reduce the cost to cast Demon of Death's Gate will apply to it even if you choose to pay its alternative cost.
(wotc • 2010-08-15)