Yeah I think this is mostly a good reward for throwing a LOT behind one ally and having two other characters be in Support stances; you have one character who has to be in Training ? and another who has to have Crosshair Song.
Then, you're spending two actions (most likely Watch Closely and something off the given Form) to hand Crosshair Song a Training Token, and Crosshair Song needs to either be Fused Wardancer, or have a SPECTACULAR roll.
It's 4 actions across two turns-- which allows the enemy forces to respond-- and demands either good rolls, or (for more consistency) a Fused or Frantic Wardancer in Crosshair Song.
Hell to pull off-- it's VERY swingy. At base, it only works 1/3 of the time; a Fused Wardancer Gunkata can do it 3/4 times and a Frantic Wardancer Crosshair Song turn (good GOD) can even then only pull it off 7 times out of 8.
But when you're talking about Fused Wardancer Gunkata and Frantic Wardancer Crosshair Song you're literally building a character to do this, so, like, yeah, I sure hope you can, because this is a character who has spent a Stance and an Archetype to do just this one thing and will likely eat entire enemy turns without real recourse in any weight class that can withstand that kind of power.
ETA: There's ONE other problem with this. Like with other Token removal or discard options, you HAVE to remove that many. This means you can get through the bad token options and be left with the Basic Tokens you want to keep around!
ETA*2: Also, if that Boss had Armor you would not have been able to do that. Note that you can only spend one Power per hit unless you're in Power. in addition, anything that gains Iron off instances of damage (Underdogs, Taunting Style) would have an easier time.
ETA*3: and I completely m issed that it's going to be changed in any case. Whoops!