Playing with a dlsingle, and watching the video - it appears to be a small issue with her mechanism.
My background is in testing -
What appears is one queen (with taunt up) guards 4 cards. If two - five are up, they remain all remain vulnerable.
This is not inline with current use of duplicate cards and diminishes multiple use strategies. 2 queens up means you take 2x the damage from AoE mobs.
One potential tweak - is to only allow the last queen fired to have a minion - which trades taunt for protection.
First queen fires - minion formed - team shielded.
Second queen fired, check performed, queen1 minions killed, Queen2 minions formed, team shielded.
As is - chasing multiple queens doesn’t provide an incremental gain (through synergy) and if mechanism is to be reused, May cause issues.