While some people might assume that being gold gives them more value than a standard card (thanks to the value of actual gold), most gold cards fall squarely into the $2-$5 range of value
Creatures that add mana can feel a little sidelined once you get your larger creatures in play, but not so with Gwenna
The archetype specifically looks for power of four or more, and there are lots of creatures that fit the criteria, buffs to get them there, and payoffs for hitting the target
(2014-11-24) You must ensure that your face-down spells and permanents can easily be differentiated from each other
Since you unfortunately won't find a Jesse card in The Glory Of Team Rocket set, this is probably the closest you'll get, given the visual similarities and cold confidence Ariana exudes
If you want to go the best storytelling route, combine the Hand, Eye, and Book of Darkness to create the actual Vecna, an 8/8 indestructible Zombie God that gets the triggered abilities of all three