Theopholos, Order Acolyte (UNK-RW04E) - Unknown Event

Mono Eminence — As the game begins, if Theopholos is your commander and your deck's color identity is mono-white, your starting life total is increased by 10.
Whenever Theopholos attacks, if your life total is greater than your starting life total, creatures you control get +1/+1 until end of turn.
Partner (You can have two commanders if both have partner.)