A Gathering Question?

While the Gatherers game is based heavily on Magic: The Gathering lore, should my posts substitute names of my own invention?  I don't know that I'll ever seek to publish any of this, so I don't know how much an issue it could become?  If I choose to continue to be utilize Wizard of the Coast's property, are there any notices I need to post that I'm not challenging their ownership of the IP's used?