This dog commander is also great with living weapons like Batterskull and sagas you want to get the first two chapters of, like Elspeth Conquers Death
Knight of the White Orchid is the sleeper of the format
Some things that may draw you into specific colors are: A really strong rare you're excited about Plenty of "removal" cards that can deal with your opponent's creatures A lot of playable cards in that color A good "mana curve" in that colormeaning lots of creatures of different costs Ideally, the colors you pick will have all four of these criteria, but if two or three of those are true, that's plenty good
Prices change a lot depending on your region so take a look at Cardmarket, Amazon, Bazaar of Magic, or eBay to find the best price for yourself
Discarding cards to efficiently draw new ones
This isn't a big deal if we're grabbing a lot of cheap mana value creatures and planeswalkers or if we have a lifegain strategy with our deck