Here is what I want to know. If I have luke with jedi robes on him. His dice are showing 2 melee, 2 melee. Can I play destiny, remove one 2 melee side and replace jedi robes with Mind probe?

Yes, you're able to modify the cost of a card while playing Destiny. It Binds All Things is also usable to reduce the cost of your target card, so you could potentially only pull a 1 side die with IBAT to overwrite into Mind Probe.

Thanks