Whimsicott has endured across generations, not only because of its playful and approachable design but also due to its adaptable role in the Pokmon games
That's because the Leyline of Resonance deck isn't actually that good
The way I see it, nobody should be bullied or groaned at for playing some hatebears or other interaction light Stax in casual EDH, when people are playing so many best-in-slot cards like Dockside Extortionist, Jeskas Will, or even Sol Ring-into-Signet starts
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Aerith Rescue Mission creates three Hero creature tokens, which can be used as sacrifices for other effects
Its a 1-drop, so its not a huge cost to put it into your deck, and I also like the fact that Twists and Turns later becomes a land similar to Search for Azcanta / Azcanta, the Sunken Ruin, but for creatures