pokemon card price chart Ultimate Trading Guide for Your Collection – Vanity Slabs Inc Pokémon Cards by Market Cap
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Anyway the article has good explanation on this topic

The reason is practical: competitive players want copies they can use without overpaying for showcase art

Big brains and big swings defined this one

The ability to recur itself, be regularly cast for one or two U mana, and the option to flashback spells that cost 2 (such as Manamorphose ) are all attractive reasons to include this card in UR
That's 56 booster boxes worth of money, and those 56 boxes would statistically give you 12 SIRs total (probably not the ones you wanted)
