Shivan Fire is the worst of the three as paying 5 mana for 4 damage is a poor rate, and while more reliable than the others, a lot less powerful
(Pre-combat) main phase - During this phase, you can play 1 land from your hand and any abilities that activate during your main phase activate now
If your favorite card isn't in today's list, it could be next week's
One of my favorite multiplayer planeswalkers of all time is Sarkhan Vol for his +1 to haste and +1/+1 your team
I expect to see her a lot in decks that can turn creatures sideways, including a deck from my in-person playgroup thats built around Grenzo, Havoc Raiser and a suite of supporting goons that allow him to literally rob his opponents blind while generating an insane amount of value
On the other side of the scale, we have Oko, Thief of Crowns at over $30, along with another four or five mythics in the $10+ range, all of which are solid opens, with Oko itself being enough to (likely) make your box a winner in terms of value