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Depending on the situation, Harpie Dancer can be used to swap out material for an Extra Deck summon, return a vulnerable Monster to the hand, or get back a Monster with an effect that activates in the hand

They're ideal in your opener, and after that you can try to discard your tapped land for value

Mulligan until you have a comfortable manabase and go from there

These rates are estimated from community data and not officially confirmed by The Pokemon Company

You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity

As such, knowing the basics the matchup is useful