Enthraling Monstrosity

Flying, lifelink, soulbond
Enthralling monstrosity can pair with creatures
with or without soulbond, any number of times
—Enthralling monstrosity gains +1/+1 for each
creature paired with it. At the beginning of each endstep, put a -1/-1 counter on each creature
paired with it.
"The second of Talgar's retinues wielded a steed that enthralled the mortal minds of the weak"