Red spells like Comet Storm will deal out huge amounts of damage whereas blue instants like Snap will be low-cost ways to control the board
The issue here is that Planeswalkers are, by definition, legendary
You can tap Sorrow's Path to swap two of your opponent's blocking creatures, so long as you don't create illegal blocks
The resident menace when it comes to counters decks, planeswalker decks, and many builds in between, Atraxa has proliferated in usage since release, enjoying multiple reprints
Timed right, that can be a massive game changer
Not only is this a big creature stats-wise, clocking in at 5/5, it also gets +2/+2 as long as you control your commander