Akrytos, Khenra Overlord

Eminence Whenever a jackal enters the battlefield under your control, as long as Akrytos is in the command zone or on the battlefield, you may put a +1/+1 counter on each other jackal you control. If you exert a jackal, untap it at the next end step.
~Jackal creatures you control gain indestructible and "You may exert this creature as it attacks, if you do it gains double strike until end of turn."
~Partner