You could even have an additional power level if you wanted: the first ten cards of the powerboard adjust the deck up to a certain power level, while adding the rest of the powerboard will increase it a bit more again
(11/10/2020) If you have two commanders with the partner ability in the command zone, Command Beacon's effect puts one of your choice into your hand, not both.
However, this doesn't mean that you should jump right into complicated Modern decks
This often also involves them retreating an active Pokmon with enough Energy and HP to trade a couple hits to put in a weak Basic just to stall for time without any consideration for the player's point total, and immediately losing because they did that while the player was on 2 points
It is supposed to be better than Mint
This four-mana Merfolk gives you a ton of Wave tokens when it comes into play, though they are just little 1/0s that cant stick around once Master of Waves leaves