Lets start by recognizing the battles range, including their in-game cost to play, also known as mana value, and the effects they provide for that cost potentially the most critical threshold to establish, since a large part of effective deck construction is maximizing the return on your mana investment at various points in a games early and late stages
theres also something to be said for its greatest use requiring you to have a handful of lands but this sees a fair amount of play and is incredible with landfall commanders like Tatyova, Benthic Druid and Tannuk, Memorial Ensign that keep cards flowing
Fable accelerates your mana like a Ferrari while threatening creatures
Be aware of which color is hard to splash from your base color and take cards accordingly
Really cheap sweepers like Path of Mettle, Golden Demise, and Goblin Chainwhirler are still effective, but your opponent needs to have exactly the right answers