mewtwo pokemon card 151 052 SV Promo Case Weakness / Resistance / Retreat Cost Mewtwo 151 Ultra Premium Collection

Being able to wait until the last moment keeps opponents guessing and lets you pivot based on what the table is doing

Do you have an opening in your Gatewatch

This ability is very similar to cascade in the sense that both let you cast spells for free, with the difference is that the mana value of the cascade card determines what you can cast, and discover X is based on the value of X printed on the discover card

Of course it gets even better when its ETB is doubled by Panharmonicon

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