I cant see it been that bad? it would slow the game a little probably but a new colour means new possibilities for future characters and also others who may be getting a 3rd power
A new color would pretty much break the game. The number of colors that you can use in a match 3 game are well studied for different grid sizes: You can’t make an 8x8 grid playable with 7 colors any more than you can make a 6x6 grid playable with 3. The number of available moves changes dramatically, along with the percentages of 4 and 5 chains.
If you’ve taken any Probability & Statistics class, it’s not really all that complicated to do the math yourself and see how adding a single color warps the game. Just check, on a random board, the probability of being able to match 3 green with 6 colors or with 7. It’s pretty drastic.
Also, Silver Surfer has absolutely nothing to do with the Dark Reign storyline. There’s a whole lot of heroes that fit better when your big villain is Norman Osborn.