Shared Animosity

Whenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature type with it.

"A king must live a grander life than any other's,
and embody his people's image of admiration! Yes!
Yes! Yes! He who is worthy of all heroes' envy, and
he who leads their way, is the king! Therefore, the king is not alone. For his will equals that of all his followers combined! Yes! Yes! Yes! Now, then, Shall
we begin, Assassin?"