You know him, you loathe him, the one but as it turns out not only @mgoveia.
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At first I couldn't grasp how so many people could harbor such animosity towards one user. Let's just say I'm older and wiser now. That and, you know, he ruined MLP for everyone on this site. (People like him tend to do that.)
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Given this, there could be no better pick for him than Nightmare Horse — https://yugipedia.com/wiki/Nightmare_Horse —.

Now this seems a tad nihilistic, but rest assured that there is hope. For there are people who do have totally original ideas, who don't follow what others say and make up their own minds and opinions, and who are not like the other girls.

Can't you hear, can't you hear the thunder?
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If the past few year have been any indication, the imagery in the card art isn't all that inaccurate. Hopefully, this year will be better.
Speaking of card art, this one fittingly enough comes from one called Convulsion of Nature — https://yugipedia.com/wiki/Convulsion_of_Nature —. I didn't even change the effect, that's literally what the card does.
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Convulsion of Nature was one of favorite cards to play back in the day, and one I had a physical copy of, too. Despite its name, it's not that powerful, but its unique effect certainly made duels more interesting.

Commemorating the raising of the Union Flag at Sydney Cove on January the 26th, 1788 by the very first European settlers of Australia, this holiday serves as the National Day of this country. Like many colonies of the British Empire, Australia's history has not always been rosy; thus the significance of this holiday has changed over time. Currently, it aims to emphasize the diverse cultural landscape of the nation and to promote a sense of community.
If I recall, we do have Australians on this site. If so, I hope they're having a bloody ripppah of a time in their thongs (it's summer there now, right?) while puttin' some s̶h̶r̶i̶m̶p̶ prawn on the barbay and drinking anything besides Foster's. (Sorry, I'm not too familiar with Aussie slang. Learning it is hard yakka.)

This one was a challenge as @scatmandingo requested that I take inspiration from his username. As you can see, I chose the "Scatman Dingo" route, rather than the "Scat Mandingo" one.
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I'm sure that's what Scatman John would look like if he turned into a dingo. The resemblance is uncanny. Of course, the card used is Danger! Dogman! — https://yugipedia.com/wiki/Danger!_Dogman! —, itself based on the Michigan Dogman.
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The effect flavor might be less obvious. If spellcasting comes down to who is the best chanter, I've no doubt that Scatman would win. Kinda like in a rap battle, though in this case I guess it would a scat battle... Wait....

I can't quite figure out what the theme is though.

I understand most people (99%, in fact) like food, particularly if it has a rich flavor.

Can pigeon magic beat the heart of the cards? Only @mr_pigeonwizard may know the answer.
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Yugioh once again does not disappoint with card variety. The card used here is Shinobird Pigeon — https://yugipedia.com/wiki/Shinobird_Pigeon —. "Magical Pigeon" is an actual, albeit anime-only, card: https://yugipedia.com/wiki/Magical_Pigeon
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Another fun fact is that threre was a character who used the alias of Pigeon in Yugioh VRAINS: https://yugipedia.com/wiki/Pigeon
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Coincidently, I used said character in one of my posts long ago: https://m.funsubstance.com/fun/564119/froggo-fun-62-pigeon-and-frog-conspiring-to-take-over-funsubstance-circa-2020/

I wish I were half as good at consoling people as that frog is.

#notallfunsub
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Buy yes, let us brace ourselves for one or several paragraph-long comments about your ceaseless persecusion of the poor rich people.

Indeed, the best way to summon @catfluff is to tag her in cat-related posts.
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Yugioh has a wide range of cat (and cat-girl) monsters, as well as more than a few fluffy monsters. But ultimately, I had to go with Rescue Cat — https://yugipedia.com/wiki/Rescue_Cat —. Not only was it a powerful card during the early Synchro era, but @catfluff herself has undoubtedly rescued others from sadness on numerous occasions.

Truly a modern masterpiece.