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When Supply Caravan enters the battlefield, if you control a tapped creature, create a 1/1 white Warrior creature token with vigilance.
If an effect causes Supply Caravan to enter the battlefield tapped, it will satisfy its own triggered ability.
If you don’t control a tapped creature as Supply Caravan enters the battlefield, its ability doesn’t trigger, even if you can tap a creature right away. If you control no tapped creatures as the ability resolves, nothing happens.
