The set is available for preorder now from your local game store, Amazon, TCGplayer, and elsewhere Magic products are sold
Funnily enough, you only really want one of these in your sideboard because drawing it is a complete disaster and basically leaves you down a card, unless you have a way to discard it for value
Like most Magic: The Gathering cards, the value of Indicate depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Mystery Booster 2)
You can sometimes "splash" a third, playing two colors as your base and a couple powerful cards or additional costs of another color, but I'd really focus on the two colors you want here
Commander Variants A few varieties and flavors of Commander have popped up since it began
Its especially strong when paired with cards like Benevolent Geist and Taigam, Ojutai Master that protect your noncreature spells from being countered, giving you the spell and the doves