Hello! I am a regular magic player but it is the first time I play magic arena. My question is: Can i buy in this forum an access to play a sealed / limited theros? If so, how much does it cost?

On MTGO? You buy tickets to enter those events.
On MTGA? No, there's currently no codes that give you sealed or limited entree in theros. You can buy gems to enter them, but gems are not tradable

different sets have different prerelease kits and other things like promos and planeswalker decks, expensive sleeves, packs, etc. so yes in mtg arena in the longrun you can buy codes here. most of them are limited to 1 per account. hope that helps

the theros PR was 6 packs however so no drafts for theros...

This post was edited by PopNutShanty on Feb 8 2020 12:07pm

ty m8s, The only way to play draft is to buy gems?

This post was edited by ArchiDuque on Feb 8 2020 03:28pm