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Plains 3

And while his fandom might make this particular card popular, right now there seems to be a limited use case to justify adding this flounder to your deck

Like Umezawa's Jitte or Sword of the Animist, or any random planeswalker or key dorks like the 50+ in this set alone

It wins most combats very efficiently and can even blank some removal

Tellah, Great Sage is a little vulnerable to removal since its only a 3/3, but untap with this in a good spells deck and I cant imagine youd lose very often

Progenitus Progenituss second ability isnt really that relevant to Commander since you can just return it to the command zone, but a 10/10 for 10 with protection from everything is nothing to sneeze at