Quote from Valros »For black: Haunting Shadows? Holy crap that's good, and completely broken with any sacrifice engine: Xanto Gatherer for one (sac for card, put copy into play, sac that one, copy it, ad infinitum...) Xanto Necromancer for another (you'd get essentially free tokens each turn), Dimir House Guard thirdly (essentially indestructible even by itself), Altar of Dementia, Ashnod's Altar et cetera.
For red: Fry is another Lightning Bolt but unpreventable...and they stopped printing the Bolt.
For the multicolors: Seeds of Renewal, essentially, says "Shuffle all lands you control that aren't in your hand or removed from the game back into your library." I can't really see the usefulness in setting myself back a whole hell of a lot just for less-than-efficient land recursion, unless I had a lot of Sakura-tribe Elders or something.
Quote from Kraj »Sowing Seeds: Three lands is a lot to tutor for at once at any cost, especially when you put them into play. Honestly I think it would work find at this cost but with two lands. Looking at Kodama's Reach, you'd get a slower effect but that also doesn't use up a land drop.
Quote from AnTwan »Fry was supposed to be a lightning bolt at Rare instead. I thought it would be kind of nostalgic and cool and okay at rare... maybe I should think of some other type of burn.
Quote from Kraj »Nostalgic and cool? Yeah. OK? No.
Cards that push power level are often, but not always, rare. Making a card rare is not a free pass to push the power level, though.
Quote from Eliminator »My two cents: Horse Plow is restricted immediately in Vintage and banned immediately in other formats, it is 300x more broken than the Moxen. Also, the black card that destroys permanents is out of pie (black can't destroy enchantments or artifacts).
Quote from QuantumEcho »I know I'm responding quite late, but I believe Wizards would word Prayer as:
Prayer (If any amount of damage dealt to this creature by a single source would be prevented, prevent all damage from that source instead.)
I know that's probably more wordy than you would have liked, but you have to be specific about touchy mechanics like that.
Quote from Seanus24. Protection - NO, you cant give out hard counters for 1 mana. Most spells will target perms you control, add another restrictions like "non-creature perm you control" and it will be acceptable.