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She can give you oodles of mana easily, she can draw you cards, and she can synergize with many other untap effects to produce more mana than you know what to do with

This card may be perfectly good in a specific deck yet not playable in others

Luckily, there are only a very small handful of cards in the deck that would be affected by this ability

Plus, Growing Threat is about the most boring deck name I can think of

Kalemne, Disciple of Iroas was a cautious step in the right direction, encouraging decks led by her to go Tall instead of going Wide, but the commander herself is on the weak side, and she does not provide enough incentive for the playstyle she promotes