Doubling up on all spell-based triggers is already strong enough if all you ever consider is prowess, but you have to factor in magecraft abilities on cards like Archmage Emeritus, as well as pinger effects from Coruscation Mage and the like
Teval's primary role is not to lead the Sultai but to arbitrate the clan, acting as a check on the power of the Fangkeeper and other leaders as a balancing force
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Putting loyalty counters on it with every card draw is a little absurd, since Wheels definitely happen in Commander games
Trading initially will only let you transfer certain cards between players, not everything
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