Just my 2 cent on ''Is that shit P2W?'' Well yeah kinda. I can easily fork real dough for the in game currency , get myself 1 box of each set ( with a few assured mythic WC and such ) but has a non paying player right now , the economy is pretty generous and the more pack / cards you get , you get to unlock the Vault , which contain some pack and WC . So unless like Scruffy said , and youre looking to get 6+ more fully fonctionnal deck , well its start paying or start grinding . I think they have a nice balance right now , they also took in a survey regarding the economy a few days ago.
Has for mana screwing , well its MtG , wouldnt be mtg withouta few mana screw/overload here and there. Im rarely under 22 lands in most of my deck. For a quick weenie aggro its 20-22 lands , up to 25 for midrange and 25+ for control type , usually 26-27. And with 3-4 evolving wilds to thin out the deck a bit. But gotta admit , its frustrating to get mana screw /flooded like 5-6 games in a row . thanks god that never happened in Arena for now.
Also , ive taken up paper magic since they are a few cards shops in my town with events , bought myself the 2nd sun control deck . tweaked it out a bit with dominaria , ixalan . Feel so god damn cheap playing 2nd sun and scrying like crazy . It does work tho , solid deck , only problem I had was vs Hazoret aggro and a mono green aggro. Also dueled with a young dude who had a real cheap ass deck ( 3 colors BWU , Tetsuko + with a horde of rats , the unlimited 2/1 that im forgetting the name ) prying blade , visionary aumenter and weird random shit like that , he went 2W1L vs 300$ + decks .
God i miss Aether Revolt in Arena , so much fucking good cards in there. Ho well , its gone in september anyway.