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While the original Ertai card, Ertai, Wizard Adept from Exodus, is somewhat underpowered by todays standards and his follow-up card, Ertai, the Corrupted from Planeshift is only a niche Commander option, its 2022s Ertai Resurrected from Dominaria United that truly shines across multiple formats

One aspect of tweaking that is very often overlooked is the mana

Able to counter any spell, and letting you still have access to other mana at the end of it all for follow-up interaction, this one is worth consideration in anything that wants to play Draw-Go

At the beginning of your upkeep, tap this creature unless you sacrifice another creature

And this is just a land that taps for your color, so there is no opportunity cost to run it