Many decks use this reliably, and I can only imagine how many more would do so if it were printed as an uncommon or common
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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
This means a complete overhaul of how the games will play out, but were expecting synergy-based decks to still be the way to go, with all of the normal strong Limited card staples still being importantefficient removal, evasion, and difficult-to-answer bombs
When creating unique decks or sets with customized mtg rare find abilities, its important not overlook these determining factors such as casting-cost
You also dont want to skip out on Young Pyromancer or Wavebreak Hippocamp ether since youre casting at least two spells per turn anyway