That's nasty, because there is always someone frumping around with a bunch of key permanents to take out, like Primeval Titan, Deadeye Navigator, Elspeth, Sun's Champion, Karn Liberated, the aforementioned Mind's Eye or Sylvan Library, all of their non-lands
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Tron also tends to be the strongest top-decking deck in Modern
One of the best green artifacts in Magic, Lifecrafter's Bestiary does a great impersonation of a permanent Glimpse of Nature, with a free scry on top every upkeep
That, in our simplistic understanding of game design, means they need to combine: Low mana cost Having good stats (attack and fortitude) compared to the mana cost Have absolutely busted in-game effects The low mana cost was easy to justify: Agent0 is always there for you, any time of day and night
It's also a good combat trick to trade or keep a key creature alive in combat while still bringing that heat