These Vocabulary Trading Cards are designed to look similar to the classic Pokmon trading cards
As most players have the bad habit of casting everything on their first main phase, it's incredibly likely they'll move to combat and realise they've splurged all their mana and can no longer afford to attack you
The oracle text really helps here since it reads At the beginning of the end step, destroy all untapped creatures that didnt attack this turn, except for creatures that couldnt attack. If we look back at the Arbiter we see that there's no restriction on which creature can attack, so summoning sickness aside on my turn, it is likely that all but one of my creatures will get destroyed
Rather than be the focal point, Szarekh supports the deck by accruing card advantage and filling up the graveyard and he's less likely to be a target because of this
Sunscourge Champion is fine with Panharmonicon but worse than it looks because generally you want to cast Sunscourge Champion on Turn 3, which happens to be the turn before Panharmonicon hits the battlefield
