Thorn, Urû’baen Calamity

Partner with Murtagh, Heir of Misery (When
this card enters the battlefield, target player may put
Murtagh, Heir of Misery into their hand from their library, then shuffle.)

Flying, trample, haste

As long as both this card and Murtagh, Heir of
Misery are on the battlefield, both creatures get
+1/+1 and gain flying and double strike.