Ferocious Mew-Dragon

X is 13, minus {3} for each Cat you control.
Flying, trample, hexproof.
You may cast Ferocious Mew-Dragon
for {g}{g} any time an opponent's spell or
effect targets a land, Elf, or Cat you control.
{5}{w}{w}, {t}: Target player gains 17 life.
{5}{r}{r}, {t}: A creature, chosen at random,
gets +17/+0 until end of turn.
{5}{g}{g}, {t}: Draw three cards.
"Deus ex meowchina," Farisa said. "Saved by the cat."