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Also, as long as there aren't too many keywords (you can create vocabulary overload for new players), they help add flavor and cohesion to the mechanics we use a lot

Too much mana can lead to players becoming mana swamped or pulling out mostly basic mana cards and not enough spell cards to attack

You can also make it punishing for the player you give the creature to by giving them something like Phyrexian Negator or Leveler

You can spend your mana on whatever interaction you need to survive or gain advantages

Additionally, if you have connections with a distributor or retailer, you may be able to get a discount on cards to resell