you cant cheat anything in empty-handed, and your opponents should always choose to discard to make Eggmans ability less impactful
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Your total nonland permanent count will often be higher than you think it is
In contrast a card like Tower of Fortunes is a trap in almost every list because you need to input a grand total of 12 mana to draw ANY cards, meaning it's a dead card until you can generate 8 mana in one turn
It does appear in sideboards of some Modern decks and there was a nice delve-based deck with it and Card not found at its center
Even though there are just under a dozen options, the Legendary Hydras that you can choose from each have abilities that make them a solid option, whether that's Haste, Trample, or a special activated ability