Challenge Slots

{Spoiler}Simple design, I guess it's an off-color ability with that many sources backing it up. The one thing about this card though is the wording feels kind of off. While I understand it is for the challenge the fact is I'm fairly certain this kind of effect would typically just be worded as "lands with overgrowth counters are forests" or "those lands are forests as long as they have overgrowth counters on them". If this was some pre-existing type of counter or if it affected lands even after losing the counter/leaving the battlefield it might make more sense, but neither of them seems to be the case and the latter doesn't give you any means to track the lands as they move between areas.

{Spoiler}Eh I'll accept it (for the off-color matter). Black I feel is probably the hardest to really make off-color because black is kind of the "do it all for the right price" color. Rest of the game effect may be a little strong for the cost and there seems to be some mechanic/flavor disconnect, but other than that, solid design.

{Spoiler}That devil is playing a dangerous game attacking so often when its so dangerous to let it hit. I mean, even if we skew the odds to one third, that's a free Mana Leak on the opponent every third turn. A rest of the game effect is like an emblem, you can't interact with it and its always there, so I think it either needs to be something smaller or something a bit harder to trigger. Not to mention the fact that you may not have intended this, but this effect seems to stack (or at least I am not aware of any rule that would prevent the same effect worded like this from being applied onto a player multiple times), which according to ward rules would mean several instances of coin flipping each potentially triggering a mana leak.

I'm not sure if a non-red effect within flipping randomness isn't still red, but grey areas get a pass.

Overall the card has some clever ideas in it, but I think it could be use being toned down a bit.

{Spoiler}An element of randomness is a very interesting way to try to balance a rest of the game effect, particularly one so specific. I'm not sure if it wouldn't have been better to let you choose though, as otherwise the strategic value of a card like is immensely diminished to the point where I have trouble seeing how someone could really take advantage of the effect at all without potentially screwing themselves over.

{Spoiler}First of all, I want to commend you for trying to make a mechanic like epic work. I think you come pretty close to striking an excellent balance of choice and simplicity in an effect for that mechanic, which is one the main requirements I would say would be needed to make this mechanic work and be fun. Picking a creature from your graveyard while milling yourself so fast is a risky strategy, but one which gets the Johny in me really brainstorming about potential ways to take advantage of it when you're restricted otherwise.

A major downside for this card however, is that it also worsens some aspects of epic. It immediately puts you on a countdown while accelerating how fast it can be played. And while it may seem like has synergy with self-milling or other graveyard decks, those decks require further casting.

{Spoiler}Neat, a Dorian Gray reference! I like how you used the rest of the game effect on a negative side for you, thematically balancing the type of effect this was - which healed and saved you from death. I'm not sure the point of that last sentence since presumably it would only come into effect after you sacrificed it? But maybe I'm just misunderstanding something.

{Spoiler}It's hard to judge this card. At first glance I am pretty appalled. We're talking about something you can't block with creatures (with walls you can, but I doubt many decks actually run any) AND you can't target to interact with, leaving essentially AOE as your only option, then on top of it, this card has a very powerful rest of the game effect that triggers upon hitting the opponent. It does regulate itself a bit by only letting you have one of it in the battlefield at a time, and because scry is a specific action that while not exactly uncommon is not something many strategies heavily rely on or even necessarily employ. On the other hand, stuff like Invisible Stalker and Slippery Scoundrel exist, so considering your card costs at least one more colored mana... But then, I would rate that rest of the game effect as definitely higher than one or two mana, so I still think this card is a bit undercosted, if not needing a bit more weaknesses.

{Spoiler}This is definitely a super interesting effect, burning your opponent to protect yourself. That being said, I feel the protection effect and required damage are skewed in quite the wrong direction here, if there should be any skew at all. ANY damage triggers it, and each 1 damage you deal can absorb a boatload of damage in turn. Even if you lose the counters each turn, building up a sizeable amount of them shouldn't be that hard. I also think the wording in the first sentence is a bit ambiguous on whether it is exiling a card that already has a counter on it, or if its putting a counter on a card it is exiling. I presume it is the later because of the context of the card, but where possible it should be made clear on the sentence itself.

Aside from that, there is also the issue I talked about with kefke 's submission, that the wording for this kind of effect (referring to the last effect specifically) is not typically "for the rest of the game", more like "as long as it has a x counter, you may remove that counter to cast a copy of it" or something along those lines.

{Spoiler}I think by far the best design was collex 's , so I'm giving them the win! Runner up is twintania for a really interesting effect.