I found that my players enjoy the worlds of M:TG without much of the game flavor itself carrying over. The flavor of the different planes and their factions is much more important than making sure game play elements are used.
Oh, I know that could be done, but I REALLY want to give this a try. It would be something VERY different in terms of playstyle. And while i think the setting matters more, I think the M:tG mechanics I'll also help with the immersion...and I can simulate them in HERO, so why not?
First, a great resource: Gatherer
Just bookmarked it, thanks!
I'd establish a set to base the game around.
I'm leaning towards a "Weatherlight" type campaign, in which the party's ill have to travel around trying to find the artifacts necessary to stave off a full-blown planar invasion from Phyrexia (I believe?). I know that Cards like the Urza lands, Mishra's Factory and others will provide locales to hit for major encounters.
You need to decide if your players will be planeswalkers.
I think they'll be adventurers more than planeswalkers...at least at the beginning.
You need to include classic creatures and creature types: Lord of the Pit, Serra Angel, Force of Nature, Juzam, Shivan Dragon, Elves, Goblins (Mons Goblin Raiders), Merfolk, etc
Keep in mind the colors, I might go so far as to assign a color / colors to every NPC in the game
On that front, if you look upthread, I talked about all magic running off of Endurance batteries. Those will simulate the whole Mana Pool mechanic. In addition, since each pool will have a color, whatever colors a creature has access to will determine its overall color. So a spellcaster who has a Red End Battery and a Blue End Battery would be Red and/or Blue, depending on his or her active effects.
And each creature's type will determine the default color of their End Battery (though PCs can be any color they choose). So, Humans could have any color, as would Wurms and Dragons. Elves would primarily be Green, though certain subtypes could be almost any color. Most Angels would be White, while Imps would be Red, Black or White. Horrors would be Black, as would be nearly all the Undead.