The Multifaceted Phyrexian [Unknown Event]

Protection from Elk
Pay 1 life, Sacrifice another creature: Target creature an opponent controls becomes a 3/3 green Elk creature. (This effect lasts indefinitely.)
Fixed commander ninjutsu — {B}{B}, Discard a card (It's like commander ninjutsu, but the commander tax applies. Sorry, but I learned from Yuriko.)