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In many cases, a deck will opt not to play these and will instead play other Stadium cards with different beneficial effects

Most Dragons have a fairly high casting cost, so discounting the mana required to cast them lets you get powerful Dragons onto the battlefield quicker

Creature theft effects and bounce effects make it so that running a card as suboptimal as Fowl Play shouldnt be necessary even if it has an occasional nice interaction, like turning an Elesh Norn or Griselbrand into a Chicken where stealing/bouncing it may have caused you to lose

And as if that was not enough, Shark Typhoon also works on ANY noncreature spell, allowing it to serve as an alternate win condition in a variety of enchantment, instant, sorcery, artifact, and planeswalker strategies