Because Identity Thief is not a double-faced card or meld card, it wont be able to transform or meld
This will leave you with 14 cards that you can fill with: 4x Sunblade Elf 3 more Sedge Scorpion INSTANTS there are some instants that are just underwhelming, they seem good but they won't do much and they can be switched for much better cards that fit your playstyle
Along with Commander, he loves Limited, Cube, and Modern, and will always put his trust in counterspells over creatures
Setting up the game is just a case of each player placing their Leader card in their space, the DON
As you can see, your foe becomes a Monarch this turn when he ETBs, and you cannot swap over after your combat this turn
This commander can do some spicy things