The What Do You Do? Game

Check the Map
Sorcery
Choose one—
• No way around it — Put a +1/+1 counter on target creature. It gains haste and first strike until end of turn.
• Take a detour — Reveal the top five cards of your library. Put a land card from among them onto the battlefield tapped and the rest on the bottom of your library in a random order. If you didn’t reveal a land card this way, return Check the Map to your hand.

Sorry for reusing a name, but it is most fitting

Traveling so might not have time to art things up, but I really like this challenge, so definitely wanted to put a submission.

This card comes with 2 variants in flavor text, divided 50-50 in packs.

Struggle to Defeat
Sorcery 
Destroy target creature, then clash with that creature's controller. If you win, create a Food token. Otherwise, you lose life equal to that creature's power.
¹Troll, yumm!
²Ugh, well, at least we're through.

Art: Troll Giant with a club blocking a bridge over a river, with a small group of Kithkin in front of him with swords drawn

It's true that the effect is generally found in green though I couldn't check if the mechanical color pie explicitly says it must be that way (and either way I would disagree with Wizards on that approach, this really feels like a red effect if it's not only applicable to creatures with trample). That being said it's an effect you can definitely find applied to creatures without trample such as with Predatory Focus, Ruxa or Siege Behemoth. Admittedly however, the only example I could of a red version is Outmaneuver, which is an older card and being a little wonky compared to current color pie philosophy comes with the territory there (though in all fairness, it is the closest card to the one I designed, being an instant that gives creatures this ability, where the closest green equivalent is a sorcery, and outmaneuver also forces the damage to be assigned as though they weren't blocked, as opposed to giving a choice and only working on creatures you control).

Paradoxical Interrogation
Sorcery
You may sacrifice a Clue. If you do, each opponent reveals their hand, you choose a card from among them and they discard that card. Otherwise investigate two times.
“Ha, easy! I just have to ask one what the other would say and then do the opposite.”

pernicious I was also amazed by how fast I got a good picture. This one here took me quite some attempts and I'm not entirely satisfied. Thanks a lot for the link in picture into card. That also helped a lot to get the missing pictures for my custom cube.

vizionarius - Your adventurer gets sick and meets an unfortunate end at the thuggery of the footpads roaming the area. Interesting start, having the character decide not to humor the problem at all in a very conventional way. A nice simple common that can fit in many sets and has rather flexible flavor that you used quite well for the situation. Set-ready.

Idea - Fascinating! They appear to have become quite wooden in their movements after their punishment. - A very pushed modal Switcheroo. It seems like WOTC isn't partiuclarly fond of costing this effect below 4 mana recently though - Perplexing Chimera, Eyes Everywhere, Modify Memory, and most noticeably Shifting Loyalties where the cost is upped 6 for the freedom of using any type. Despite that I actually feel like the base effect isn't too unreasonable at 4 and would be fine in most formats - it's the kicker that makes me a bit concerned that this might be too pushed for how easy it could be to get int draft, because now it has the option to also function as a weaker Blatant Thievery as well and that's some pretty flexible. I think for the sake of limited this would need to be a :rare:, but otherwise I think this is a pretty interesting push of an existing effect.

twintania - It's a rather eccentric solution that results in a lot of unpleasant crunching and broken teeth, but it gets the job done. We really don't get Atogs anymore, do we? This feels like a neat way to bring one up while adding some much needed power to Morph and similar (which are typically very slow outside of limited without lots and lots of support). I bet a lot of people running Ixidron would also love it. Probably gets out of hand very fast after turn 4 but considering you have to play a specific strategy for it I think it's a pretty interesting strong atog.

pernicious - The wind shows you the way, much to the displeasure of the thugs hoping to deceive you. A nice straightfoward modal charm that makes it easier to put flying hosing effects in mainboard. Pretty graceful design and flavor.

emberfire17 - You get lucky and find your way to the next village, but you do have to do a bit of running from the angry "puzzle givers". Coin flipping with tangible risk is always a small fun effect and I think this is a nice way to introduce it at common as a last pick trick or removal. I think my only small gripe is that the flavor feels more Izzet or Rakdos even if mechanically the card should be Dimir. Would still print it as is though since I'm not sure if it could be improved.

Flo00 - The tried and true solution. It takes day before they realize the fallacy in their attempted scam. I like that the card enables itself to prevent it from being parasitic. Investigating that much seems a bit of a stretch for black but since it comes off as weaker draw and is meant to enable the discard I think it works. Good flavor and art.

Winner: vizionarius - There's a lot of good cards but something about yours flavorfully and the ability to reuse it in many sets puts it a cut above the others for me.

Bait the Monster
Instant
Choose one:
• Goad target creature you don't control. (A goaded creature attacks each combat if able and attacks a player other than you if able, until your next turn.)
• Target creature fights another target creature with a different controller.. (Each deals damage equal to its power to the other.)
Flordag always knew a full jar of grub-sauce would come in handy someday.

Yes. One of the potential intended uses is damaging one of your own creatures to remove some unwanted artifact or enchantment.