When Trial of Solidarity enters the battlefield, creatures you control get +2/+1 and gain vigilance until end of turn.
When a Cartouche enters the battlefield under your control, return Trial of Solidarity to its owner's hand.
Trial of Solidarityâ€™s triggered ability affects only creatures you control at the time it resolves. It wonâ€™t affect creatures that come under your control later in the turn.
If an effect allows you to exert a creature as it attacks, you may do so even if it has vigilance. It wonâ€™t be tapped.
Each Trial has an ability to return to your hand when a Cartouche enters the battlefield under your control. The Trial is returned to its ownerâ€™s hand only if itâ€™s on the battlefield as the ability resolves.