The MCs with Series 1: Twilight Sparkle, Applejack, Pinkie Pie, Fluttershy, Rainbow Dash, Rarity, Spike, Princess Celestia, Trixie Lulamoon, Nightmare Moon, Mayor Mare, and Derpy Hooves. (12)
The MCs with Series 2: Applebloom, Scootaloo, Sweetie Belle, Princess Luna, Princess Cadence, Shining Armor, Discord, Queen Chrysalis, DJ-Pon3, and Big MacIntosh. (10)
The MCs with Series 3: Twilight Sparkle (Princess), Zecora, King Sombra, Lyra Heartstrings, and Granny Smith. (5) Maybe Sunset Shimmer.
The MCs with Series 4: Spitfire, Flimflam Brothers, Lord Tirek, Mane-iac Mayhem, Octavia, and Dr. Hooves. (6)
The MCs with Series 5: Starlight Glimmer, Cutie Mark Crusaders (Realized), whoever else shows up (2?)
If an MC shows up late (Luna in S2 and Spitfire in S4, for example) material will be used from previous seasons to help fill in the gap. This prevents me releasing cards for units before they are ready, which was a major problem with the game as a whole.
Groups remain the same: Mane 6, Royal, CMC, Villain, Dragon, and Extra.
- Pinkie Pie's [counter] mechanic now has a way out (or counterplay), namely that each of hers will allow your rival to spend an action and time (and in this game, time is represented by the deck) resulting in additional mill costs. Any other [counter] mechanics will add other costs and will have similar counterplay. This is an obvious nerf but a necessary one.
- Flipping face down is now called Fear. It's still Nightmare Moon's specialty. More of a wording change.
- Spike still has the [Hoard] mechanic, but now there's an extra feature: If he has it, he gains [Group: Extra] or [Group: Villain] depending on cards. He's still the "Trick King" and I'm fully intending the weird interaction he will have with Queen Chrysalis.
- Gilda's a Pet now.
- CMC's MCs will not be modified in light of S5. Instead, the spoiler will be a "fourth" CMC member but is actually the trio with a new effect.