Amethyst, the Purple Puma

{1}{b}: Amethyst gains Deathtouch until end of turn.

{x}{g}: Amethyst gains +X/+X until end of turn.

Gem Fusion {3}{b}{g}: (This creature attaches to
another target creature. Both creatures gain all card
types, creature types, names, mana costs, and abilities,
as well as the combined power and toughness of both creatures. They're considered one creature)