If a card has particular implications in other corners of the format, Ill make specific mention of it
Being able to cheaply gain control of the board is very important in current metagame as it paves the way for you to establish your planeswalkers while at the same time makes their walkers a lot less effective
Three-mana planeswalkers have traditionally been very powerful in Standard, and Im expecting more of the same from Liliana, who protects herself as well as or better than any of the previous ones
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In commander, Elspeth most likely fits into superfriends archetypes where playing as many Magic: The Gathering planeswalkers as possible from War of the Spark or otherwise and using effects like Doubling Season and Atraxa, Praetors Voice to let them use their ultimate abilities early
Hell cost you a couple of bucks