Both previous versions of the Teferi planeswalker — Teferi, Hero of Dominaria and Teferi, Time Raveler — have been exceedingly popular in all constructed formats. But even then, Teferi, Time Raveler has stabilized at $15 a card and Teferi, Hero of Dominaria is hovering around $25 per card.
This means that Teferi, Master of Time will end up somewhere in between, perhaps around $20. However, if the passive ability turns out to be popular, the price is very likely to spike.
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