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And it's not like Terramorphic Expanse is an unpopular card - as of this writing, it's been reprinted 20 times in various Core Sets, Duel Decks, and Casual Supplements (compared to 26 total reprints for Evolving Wilds)

There's also Simic Manipulator which you can proliferate to keep yoinking opposing creatures

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If your commander is countered or destroyed it will leave you with a deck of cards that are just not as good as your opponents are playing

These will always detail how and when you use them, although it should be noted that many abilities for lower level characters will often exert the card which is symbolised with a small icon indicating a turning arrow

Turtles Forever The getting a card from outside the game aspect doesn't come into play in Commander, but getting two of four of your choices is pretty good stuff from Turtles Forever