Trial of Solidarity is a uncommon Enchantment card from Amonkhet (AKH), collector number 34. Current market price: $0.08 (foil $0.40), TCGplayer market prices via Scryfall.
When this enchantment enters, creatures you control get +2/+1 and gain vigilance until end of turn. When a Cartouche you control enters, return this enchantment to its owner's hand.