Extun, the bloody mace

Hexproof,haste
If Vextus, the bone blade, and Extun, the bloody mace, are on the battlefield at the same time they both gain +1/+1 and double strike
when Extun, the bloody mace, dies, you may spend {b} to summon a 1/1 hexproof,haste,deathtouch Extun's skull token.