(Secretly) is a new mechanic. It means that the opponent won't know which option you've chosen. While it sometimes might be obvious, other times it might lead to mind games. Basically, it boils down to that: does he want to play more minions before killing this, and don't trade - or maybe he wants to trade the minions that would die first and not play any more?
Knights of the Frozen Throne
Want to learn more about Hearthstone's upcoming Knights of the Frozen Throne? Head on over to our expansion guide.
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