dead card

American  

[ded kahrd] / ˈdɛd ˌkɑrd /

noun

1. Games. especially in poker and role-playing games, a card that is not in use during a round or that has been removed from play.

2. a person or thing that is no longer of general interest or no longer worth spending time and attention on.

---

Example Sentences

Obzedat’s Aid is as good as your best dead card. 

From Forbes

This one is a bit of trouble to set up and is a straight dead card in topdeck mode and laughable against swarms of aggressive Boros and Gruul options that will run over a player trying to get this attached and online for a potentially useless return. 

From Forbes

I had made up my mind that he was playing a dead card, as I did not think the Judge was of much force, though he always appeared to have plenty of money.

From Project Gutenberg