Mitsurugi was largely unaffected by the F&L List update that dropped on September 12, so speculators may be betting that QCSR versions of cards from that deck will be in higher demand going forward
You can activate the part of the effect after "then" regardless of whether or not you could add a card with the [LIBERATOR] trait to your hand.
But I seem to remember that there was another card that received almost as much hype as Flygon, in its own right
Read More: This Busted Combo Deck in Historic Might Need to be Banned Arlinn, the Packs Hope / Arlinn, the Moons Fury One of the more pushed cards in the set, Arlinn, the Packs Hope looks to dominate Standard for as long as it is legal
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For comparison, any Double Rare shows up around 1 in 5 packs, any Illustration Rare around 1 in 12, any Ultra Rare around 1 in 15, and any Hyper Rare somewhere between 1 in 300 and 1 in 700