If you get damaged by an attack, you can easily use Cheryl to heal all damage from all of your Evolved Pokemon (yes, VMAX Pokemon technically are Evolved Pokemon) and move your Energy around, so you dont have to Discard any with Cheryl
Combined with its leader effect, Teach can easily shut down any deck
Plague Mare is obviously not as good, as its a 2/2 instead of a 3/3 with first strike, and it doesnt deal damage to the opponent or planeswalkers they control, but it does have some upside
Unlike the other colors in this series, this one is very disconnected like Black either losing life or sacrificing dorks, or Green about dorks or reds discard to draw or exile from your library for a turn, White has tons of card draw in different boxes and ways and is very wide, but not that deep
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It can be any doctors companion, which is this sets partner, and since you can choose its color, its a free color to a given doctors EDH deck