Battlegrounds: costs mana to play card from hand

I was playing ticketaus in bg and had the ‘get a copy of discover’ quest. So I played the discover a minion from last opponents war band darkmoon ticket. I got 2 groundshakers into my hand but only one was free to deliver onto the board, the other one kept telling me I had not enough mana every time I tried to place it on the board. When I did place it, 7 mana was used. It destroyed any chance I had to win.

Mana? Battlegrounds don’t use mana. Did you mean gold?

gold, whatever, you know exactly what I meant, cost 7 GOLD to place the card onto the board, keep up the pedantic corrections, suits you well.