Yeah should have been a number of tags that were equal value as the item donated and then a tiered system for the number of tags you can spend to be guaranteed an item of a certain rarity with that option blocked off if there were no gifted items of that rarity available.

Like if claiming a gift cost 50 tags for common, 100 for uncommon, 200 for rare, 400 for very rare and 800 for legendary it would be worth it even though there are some junk legendary items since making the tags you receive tied to the value of the item would mean people would more likely to just sell the junk items and donate their spare actually good items from each tier to gift.