Torrool, Mad Scientist

Deathtouch, Hexproof,, Wither, Undying, Protection from sources with Wither.
This creature is unaffected by Deathtouch.
{1}{b}{t}, Sacrifice another creature: Target creature gets +X/+Y permanently, where X and Y are equal to the sacrificed creature's power and toughness. The creature also gains all abilities and creature types of the sacrificed creature.