substitute cards mtg MTGNexus Then the spells controller may choose new targets for it. Substitute card - MTG Wiki

But in Prince John - Greediest of All discard decks he is much worse, in my opinion, than a card like Daisy Duck - Secret Agent

If that didnt hurt your opponents setup as much as you would like it to, you now have a five strength and four willpower character at your disposal

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(I always imagine it like being what youd get if chess had certain edge cases where rooks could fly, bishops could teleport, or for a second, pawns were driving tanks.) Since the game is built around several thousand collectible cards, and almost every card has some additional unique ability to it one way or the other, it creates an endlessly manipulable, constantly surprising experience

But there are always exceptions to the rule, such as heavily creature-focused decks that cut down on instants, or Commanders Like Codie, Vociferous Codex that prevent their player from casting permanents