Lorthos, Tentacled Terror (UNK-RU08A) - Unknown Event

Mono Eminence — As the game begins, if Lorthos is your commander and your deck's color identity is mono-blue, your starting hand size becomes 8. (You draw 8 cards and your maximum hand size is 8.)
Whenever Lorthos attacks, tap all permanents your opponent controls.
Partner (You can have two commanders if both have partner.)