Big deck energy: How to build a Commander deck Originally, Companion cards could be played right from the sideboard, but this was deemed too powerful pretty early on, and the rules were updated a couple of months after Ikoria came out
Sliver Hivelord (Commander Catchup, Part 3) Keranos, God of Storms
You don't make any decisions about new targets for the spell until you win the flip
Our goal is to protect ourselves early by amassing an army (Moria Scavenger) and stealing our opponents stuff (Hostage Taker) while milling/discarding huge haymakers (Rampaging War Mammoth)
Most decks can utilize a Fog effect at some point in a game, too
Blister or booster packs can be relatively affordable, but the more you get, the more the price adds up over time