Cartouche of Solidarity is a common Enchantment — Aura Cartouche card from Amonkhet (AKH), collector number 7. Current market price: $0.24 (foil $3.67), TCGplayer market prices via Scryfall.
Enchant creature you control When this Aura enters, create a 1/1 white Warrior creature token with vigilance. Enchanted creature gets +1/+1 and has first strike. (It deals combat damage before creatures without first strike.)