This can be used politically to allow you to get away with playing a powerful creature or asking for a favour from an opponent
The key card in this strategy is Show and Tell
At the moment, the Commander card pool consists of all regulation-sized Magic cards publicly released by Wizards of the Coast other than those with silver borders, gold borders, or acorn-shaped security stamps
For you, however, he can turn the table in your favor
The only mono-blue creature among bears, Phantasmal Bear is only really usable in a Minn, Wily Illusionist deck
You only get to use that mana on opponents turns, but still thats usually when you want to use it anyways