In a large bowl, combine the chickpeas, artichokes, olives, tomato, cucumber, celery, carrots, onion, and dressing until well combined.
Cut the stem off and pound the tough part of the center vain of the collard green leaf until it bends easily. It may split a little, don’t worry about it. Steam the collard greens in a pot of boiling water with a steamer basket for 3 minutes to soften. Fill the center of the leaf with the salad and roll it up. Cut into three pieces. Repeat with the rest of the wraps.
FOR THE DRESSING
Whisk the tahini, water, lemon juice, garlic, cilantro, oregano, cumin, and salt and pepper together until well combined.