The biggest thing that holds them back is their mana cost
If anything, having Jace appear in the midst of The Fellowship of the Ring would be hilarious
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The cost is 1R, but players have to sacrifice Furnace Skullbomb too, which costs one mana of any color to put on the battlefield
This is a bit weaker then the cards higher on this list primarily because of its mana cost
The same would also go for a character that you were trying to give a Keyword to twice, that didnt have it before