Like most Pokmon cards, the value of Clefairy depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Evolutions)
Sat, Aug 08, 3:00pm - 5:00pm West Las Vegas Library - Innovation Lab - Room 158 Practice your DJ skills in the Innovation Lab
While Tocasia's Welcome is far from being our mighty green artifact, it can still provide you with enough card draw through the course of a game to justify running it, especially if you use creatures with flash like Cathar Commando that can be played on your opponents turn to draw a card
You could have Idris become a Mana Crypt or an Arcane Signet to ramp to your wincon
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It can recycle some of your more impactful ETB cards like Puppeteer Clique or you can return Glen Elendra, Archmage back to hand to get rid of the -1/-1 counter and reuse her once more