Militia's Pride is a rare Kindred Enchantment — Kithkin card from Lorwyn (LRW), collector number 30. Current market price: $7.45 (foil $15.00), TCGplayer market prices via Scryfall.
Whenever a nontoken creature you control attacks, you may pay {W}. If you do, create a 1/1 white Kithkin Soldier creature token that's tapped and attacking.