Piercing Ox

If Piercing Ox is tapped at the end of your combat phase, untap it. At the start of your end step, Piercing Ox attacks target player. Treat this as its
own combat phase, but no other creatures under
your control may attack.
Infinite Charge- When Piercing Ox attacks, place
a +1/+1 counter on it.
Shikigami Reincarnation- Infinite Charge