Shared Animosity

Enchantment

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.

"The feud between dwarves and redcaps had raged for so long that no one could quite recall how it started. Few would believe it was sparked by a long-ago dispute over a spoon." —*Assault on Delverhaugh*