Dark Anonymity

When Dark Anonymity enters the battlefield,
target creature you control becomes a Rebel in
addition to its other types and gains Menace.
Whenever a Rebel creature you control would be
destroyed, you may sacrifice another Rebel
creature you control instead.
"So, if this guy can just copy whatever ability he runs
into...how the hell are we supposed to identify him?"
—Blyke, Loyal Jack