They are just a predefined token cards sometimes create
Heist One of the key reasons heist works as an Alchemy: Outlaws mechanic is that it counts as a crime
Its why you should read up on Secret Lair carefully before committing to buying these Sonic the Hedgehog cards
All at instant speed Filter Out Returns all nonland, noncreature permanents to their owners hands (this does hit your permanents as well) Otawara, Soaring City This land is an auto-include in any deck with blue, if you have it Enters untapped The channel ability allows you to return an artifact, enchantment, creature or Planeswalker to its owners hand Stern Dismissal Returns an enchantment or creature you dont control to its owners hand Kioras Dismissal Return any number of enchantments to their owners hands Must pay an additional blue mana for each target beyond the first Chain of Vapor Return any nonland permanent to its owners hand Its controller can copy Chain of Vapor by sacrificing a land and chose any target for the copy This spell can continue to be copied so long as the conditions are met, potentially creating a chain of spells

The way these charm style cards improve magic is nothing to do with reducing floods or screws but to do with their utility and how that allows you to improve your consistency
You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost