As always, foremost in your mind as you draft should be your mana base, mana curve, creature count, removal spells, and card advantage
The seller is "onlyrusmtgcards" and is located in Saint-Petersburg, RU
There are a lot of powerful upgrades to the archetypes tackled with these Commander decks, like Inventory Management for equipment decks and Strong Back for Voltron decks, but as far as universal cards go, there arent a lot here
The deck builder allows you to pick a card, and then it suggest the optimal deck from your remaining cards
Melvin is just being Melvin
Callous Oppressor made attacking and blocking nearly impossible for an opponent if they didn't name wisely when it came into play