The Winged Dragon of Ra

Flying, haste, vigilance
As an additional cost to cast this spell, sacrifice
three creatures. This spell can't be countered.
When this card come into play you can pay life
points until you only have 1 remaining, this
creature's power and toughness become equal to
the amount payed.
Pay two life points to target and destroy one of
your opponents creatures.
"Spirits sing of a powerful creature that rules over
all that is mystic."