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Authority as an ability would be pretty useful on a creature, definitely not sure if that'd be more printable than Pro-Weenies as you originally posted, but it'd be a nice ability that ends up feeling fairly simple/straightforward

Simic Signet

Thrun, Breaker of Silence is a solid midrange creature to apply pressure on your opponents

Its extremely good but in an entirely different way from something like Uro, Titan of Natures Wrath

Sarkhand, Soul Aflame reduces the cost of all your Dragon spells by one generic mana while in play, making it an auto-inclusion in just about every Dragon commander deck that can play it