Shar and Zu'Kin

Double-Strike
When Shar and Zu'Kin is summoned, additionally summon a 0/5 Blue Spirit creature token called Zu'Kin with Double-Strike
When Shar or Zu'Kin is declared as an attacker, untap the other. If both are declared as attacking, grant both of them +2/+2 until end of turn