In fact, people generally choose MTG Arena over those other games because they love the game, and likely because they like playing paper MTG without having to be next to someone
When Protean Hydra would be dealt damage, that damage is prevented, and that many +1/+1 counters are removed from it
Of course, you can also just make sure that even destroying your own stuff is to your advantage if you want to, or just play it to an empty board on your side
Unless I'm mistaken, Markov Baron is the only card with both madness and convoke, so when your mana is tapped out and you're faced with a Mind Rot or need to crack a blood token, three creatures can save this baron, it's sweet
Most of the rules that govern how transforming double-faced cards apply to the new modal variety