Tournament rules define what is authorized, and they restrict cards labeled Not for constructed play and Playtest in Constructed events
I also believe that he will cross over to cEDH tables as he is the second outlet for Isochron Scepter and Dramatic Reversal in Esper colors and likely the stronger of the two
Additionally, if Izzet Storm ever becomes popular again, you can sideboard one copy of Mindbreak Trap too
By playing this card, the player can choose to banish one of their own characters in order to banish an opponent character of their choice
Spellslinger decks can take all manner of forms, but they all follow one core tenet: to gain advantage through the use of instants and/or sorceries
As far as Yawgmoth is concerned, you, your opponents, and planeswalkers aren't Humans