Panoptic Mirror I, personally, have been a Panoptic Mirror enjoyer since it was originally printed back in Darksteel
They make good early investment on Arena for the next two years
Instead of dealing damage, any damage Szadek would deal instead causes a player to mill that many cards, and then Szadek gets that many +1/+1 counters, doubling how many cards will be milled the next turn
Something to keep in mind is that Kardur will force all creatures under your opponent's control to attack if able, even if they entered the battlefield after Kardurs ability is triggered
Matches felt more exciting right away, and it was beyond satisfying to set off the row of dominoes that were my card synergies
Jeska's Will won't usually give you as much mana as Inner Fire, but with three opponents, you'll almost always be able to come out mana-positive