The "Call the Spirit Dragons" card has a very specific effect - and while it "technically works": currently it will highlight the eligible dragons to get a counter for each color , there is no clue on the screen or in the text, of which color you are adding the counter for.

For monochrome dragons that is not a problem - but add multicolored dragons to the mix and things get messy: one has to double check several times otherwise the win-condition can be easily missed - doubly so in the heat of the game. (The screen shot was against Sparky, and I had a single golden dragon out - even there I had to take extra care not to put the R or W counter on it, as it was the only B dragon in the field).

For the reference, the action phrase for putting counters is (more or less) "Add a +1/+1 counter for a dragon of that color" - while highlighting the eligible dragons. If there are 3-4 golden dragons there, it would be a ton easier if it was just writing which color instead of "thar"