Its a cheap combat trick to use, and it does damage equal to twice the number of creatures in your party
But in Prince John - Greediest of All discard decks he is much worse, in my opinion, than a card like Daisy Duck - Secret Agent
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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
-6: You get an emblem with Creatures you control have haste and [T]: This creature deals damage equal to its power to target creature or player