This mole Pokmon is known for its ability to create tunnels at 60 MPH, occasionally causing earthquakes
This can ninjutsu for 4 mana and then when it smashes a foe's face you can exile the top card of each library and then play one for free without spending any mana, just losing life equal to its mana value

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If it would be easier, I can do the inverse and make a list of sets where this is not the case
That bit of available mana doesn't need to help you cast any spells to make opponents overthink if you have interaction or not
Build a deck around instants and sorceries, and Delver of Secrets basically becomes a 3/2 flyer the turn after it comes into play