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The doubled damage isn't dealt by Trance Kuja unless it was the original source of damage
For example, the upcoming Final Fantasy Pre-Release comes with six booster packs, an exclusive spindown ( MtGs 20-sided, spindown die used as a life counter), a deck box, and a traditional rare (or mythic rare) foil card
You can find Into the Inklands in game stores from 23rd February, and general retail two weeks after
If two or more effects attempt to modify how many counters would be put onto a creature you control, you choose the order to apply those effects, no matter who controls the sources of those effects
For example, if a player wanted to have a deck with a focus on Musketeers, they could combine Steel and Amber, which would allow Musketeer Mickey (Steel) to buff Musketeer Goofy (Amber) as his ability buffs all other Musketeer cards, regardless of ink type