You can cast your legendary creature from the command zone as though it were in your hand, and if that creature were to leave the battlefield to go anywhere, you can instead choose to put it back in the command zone
This article delves into what hexproof means in the MTG rules, how it works with examples, the best hexproof cards, winning hexproof decks, how to play against hexproof, and common hexproof questions
Phyrexian Obliterator and Doomsday Excruciator are absolute payoffs to put in play, and you need lots of black mana to cast them
The problem is there's so much going on that it's easy to lose track of what's already there
Llanowar Elves is another strong reprint that could definitely usher in some powerful Green stompy or Gruul monster-esque decks, but I'd feel wary about playing that kind of strategy with so many Cut Downs and Go for the Throats running around in the format
Tainted Pact, Demonic Consultation, tried and true solid strategies