Just to confirm a few things about this card. 1) it does work with egyptian god cards and also beast king requiring 3 summons, you just need an extra monster on the field.
2) If you already have this card on the field and used it's effect the game glitches and will not allow you to summon an extra copy from your hand.
Decent card situationally even though it is bugged.
Yes I can confirm 100% you can as I did it 30 mins ago. You just need to use to use it's specical effect and select Earth with one other monster on the field.
I've been messing around today with Serket decks with First Monarch and had a few OTKs