Yoshi P, is this what you wanted? (Terra Branford Blues)

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Obviously not. Maybe some of those 3 star cards out of dungeons. But even that means a chance 70-80% to NOT get it. Trials got a lot lesser drop chance for sure. You can of course get it with the first try, even with a chance of 0,0001% it would be possible.

there are no 3 star cards in dungeons

the 10-20% ex trial droprate isnt bad too, it takes less than 5 minutes for the most primals
the cards are way more common than primals mounts and never someone ever complained about these