Thats still true of the Crystals, but more decks will want those for their secondary effects, and just consider the cost reduction a welcome bonus
1999 update In September 1999, Wizards amended the Card Reprint Policy with the addition of an explicit Border-Color Policy
Another complicating factor here is that a cards Standard use is not the only factor in its price
(Back to that in half a mo.) Once you choose your path, you will be provided a Prerelease Pack that looks like this: To help you choose the path that rocks (for you), here is a helpful table: It is important to note that the path you choose for a Prerelease only applies to that particular Prerelease event
The right commander is probably Imodane, the Pyrohammer, who can spread your Burn spells out across all of your opponents to speed up your clock, but Ojer Axonil is a great alternative
Theres still room for off-color or non-mana plot costs in future sets, but in its first set, we also already see a couple of cards that trigger some ability when plotted