Hakbal is also a source of ramp, considering every time he attacks, you can play out the lands you've expanded into
Pretty much as above in most cases
In accepting that mana advantageand by extension, time advantage (or vice-versa)is real and matters, you can clearly see how devastating these exchanges can be
In a nutshell, if you are new to MTGA, claim as many Arena codes as you can so you can open packs, build them into your decks to complete the daily quests , then go for Jump In
Do you have a preference
For example, if the top two cards of your library are Brainstorm and the modal double-faced card Valki, God of Lies // Tibalt, Cosmic Imposter, you will end up with a modal double-faced card that has Brainstorm as one of its faces, and either Valki, God of Lies or Tibalt, Cosmic Imposter as the other face, with either face as the front (your choice)