Diplomatic Relations deserves special mention, not just as one of greens best commons (just behind Galactic Wayfarer) but because it was printed with missing rules text
What that means is that your aim is to completely flood the board with creatures, and then just keep attacking until youve won the game
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Modern doesnt quite have the natural feedback loop of Grim Monolith untapping to get going from low resources, but the Emry-Paradox Engine setup is honestly almost Splinter Twin with so many third pieces just winning the game on the spot
During Ikoria Standard they were as little as $5 or $6, although I'm not sure the New Capenna Triomes well go as low now that everyone knows just how good the lands are in Commander and even in non-rotating 60 card formats like Pioneer and Modern
Even if this card wasn't as rare as it is, it would still top this list for the masterful artwork alone