I have several odd cards in my deck. Example:
2 x Tower Shield
5 x Tower Shield
1 x Tower Shield
All have same stats, specs and all have black font as the name.
I put them directly into my deck and when I went to play one, it cost me no quantum and vanished.
Back story: I was playing Elements at work using VirtualBox by Oracle. I.E. crashed several times, so I downloaded a .zip from
http://www.mochimedia.com/games/play/elements that contained several versions of .swf. I was thinking if I played the game directly from the swf, my browser wouldn't crash. Anyhow, I think the cards showed up after I logged in using version 1.273 and I upgraded an Aether Pendulum. Now I see nine Aether Pendulums that show rare, and none of those work ( I think some have a casting cost of 13 and are a 1/1 creature for one round ). Odd stuff.
Lastly, I donated yesterday and selected a Shard of Gratitude. I am certain that yesterday I got one for donating and today I have four. Not sure if that's right either.
I'll try and sell the funky cards tonight. Let me know if you need any other info and I'll do my best to provide it.