Mark Rosewater talks about this card in more detail in today's Making Magic , so definitely read his article if you haven't already
Players start with seven cards in hand, drawn from the top of their shuffled Library
Orfeo, the Boulder Mr
From there, you can go: Orzhov (WB) : Teysa Karlov, Elenda, the Dusk Rose, tokens Rakdos (BR) : Judith, the Scourge Diva, Mayhem Devil, treasure synergies Golgari (BG) : Mazirek, Kraul Death Priest, Savra, Queen of the Golgari, graveyard recursion Mardu (WBR) : Alesha, Who Smiles at Death, Queen Marchesa, more aggressive builds Abzan (WBG) : Tayam, Luminous Enigma, Ghave, Guru of Spores, counter synergies The archetype scales well at any power level
Normally, you can only cast creature cards during the main phase of your turn, when the stack is empty and you have the priority