Pyromantic Gamble

Reveal the top five cards of your library you may cast all Instant and Sorcery cards from among them without paying their mana cost.
You lose life equal to the converted mana cost of all spells not cast with Pyromantic Gamble.
Last Stand (If you have five or less life you may sacrifice permanents to reduce the cost of this spell by {1} for each permanent you sacrifice this way)