I love a good meme deck. I've made / brewed loads. Some of my favourites include:
Grixis downside tribal.
Lord of Tresserhorn as commander and it's full of cards that have a slight to significant downside when you play them but none of the synergistic stuff that can be used to
negate that downside. Things like
Eater of Days, the cycle of thought eaters that reduce your hand size, the hunted creatures,
Indentured Djinn,
Rust Elemental, that kind of thing.
Manaless dredge. A classic legacy deck adapted for 100 card singleton. You really have to scrape the bottom of the barrel to even find playables when you don't get playsets and have to go up to 100 cards.
Angel of Glory's Rise combo for the wincon, assuming you could fill up your graveyard enough and not die before you could pull it off.
Minigame Tribal.
Atris, Oracle of Half-Truths and a bunch of bounce/
reanimate effects. Then crammed full of things like
Fact or Fiction,
Liar's Pendulum,
Pain's Reward,
Measure of Wickedness, and some of the Sphinxes with cool effects. This deck I actually still have and play and love (though not so much while we are playing over webcam). No real wincon, but a lot of fun.
Tour-de-France cycling deck. It's
Gavi, Nest Warden, only every card that isn't a basic cycles or says cycling on it. Every. Single. One. No talismans or signets for ramp, just that shitty jeskai crystal. No real card draw outside of cycling. Very sub-par counterspells. No real win con. But hot damn can it cycle.