Gwynn was of course designed to boost their consistency so I expect players to run no less than the full 4 copies of this supporter, alongside a lot of other cards that can discard stuff (Ultra Ball, Secret Box, Prism Tower)
Clever players try to mitigate this by stealing their opponents creatures with Insurrection to use as fodder or by flinging a giant Shimatsu at someones face, but it remains a true glass cannon strategy
If you dont know what your deck is trying to accomplish, you wont know what hands to keep, what to tutor for, or when to spend interaction
He got an automatically succeed, but wait
Some surveil cards are close to the rate of self-mill cards, and they have the bonus of letting you keep something on top you really need
Creatures are, by far, the most important thing to flash out for combat or timing enters-the-battlefield abilities for the most valuable situation, and so forth