While toughness is typically a measure of a creature's defensive ability, the printing of cards like Assault Formation, which allow creatures to assign damage equal to their toughness, has made these creatures sought after for toughness-themed decks
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Meanwhile, Time Wipe is more expensive but offers the huge upside of saving one of your creatures
I think that's what throws people as I'm usually tapped out and playing a non blue deck, so they probably didn't think I had interaction
Muldrotha decks generally play a midrange-y game plan trying to fill your deck with a balance of different permanent types to get the most out of its effect
Even if this isnt your goal, Casey provides an aggressive mono-red commander to create a fun build-around