Product Suggestion
Please, please PLEASE make some of the Jumpstart cards Historic legal that were not included in Arena last summer, now that Jumpstart is returning. The power level of the Historic format is much higher now than it was a year ago, and many of these cards are not too strong for it at all.
Rhystic Study and Thought Scour are not even close to the level of Brainstorm for example. Rhystic Study would be really fitting for control decks, yet not too powerful as tapping your mana on turn 3 will surely result in you going to very low health on the opponents turn, aggro decks kill you on turn 4. Thought Scour feels like a desperately needed addition for self mill graveyard decks, we have really no other way to feed the graveyard than Stitchers Supplier, which just isn't enough. Would fit in great with the coming blue zombies in the fall Innistrad sets as well.
Sheoldred is something cool that a lot of people would like to play in their jank decks, but that's what it is, a jank card. Simply way too costly and does nothing when it ETB's, there's no reason to not add it apart from if there is trouble coding swampwalk into the game.
But please, make Rhystic Study and Thought Scour historic legal. So desperately needed for certain decks right now, yet not format warping. They even seem needed because green currently is equal to blue or maybe even better at card draw.