Priscilla, the Horned One

Flying, first strike, lifelink
At the beginning of your end step, if you both
own and control Priscilla, the Horned One and a
creature named Teresa, of the Faint Smile, exile
them, then meld them into Clare, Quicksword
Master.
What's wrong? You seem to be missing an arm. Ah...
Here it is. You can have it back. You shouldn't leave
things lying around.