Enchantments are harder to remove than creatures, and the bouncing cost could be used as a positive to save the enchantment if an opponent tried to destroy it
A real inventory system solves this by moving the tracking burden off memory and onto a structured, searchable record one you can actually check before buying a card you might already own, or when you need to know your collection's approximate total value
And as I mentioned in my recent series of articles about the nature of power in Commander, free spells are uniquely important to this format
Timetwister & Wheel of Fortune WotC noted that wheels in general tend to be fun when they're not combined with draw hate that prevents opponents from drawing cards
Every now and then, something goes wrong
Invasion of ZendikarInvasion of Zendikar A Migration PathMigration Path with added benefits, and a tiny defense