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If the target creature is an illegal target as Hydaelyn, the Mothercrystal's last ability tries to resolve, it won't resolve and none of its effects will happen

Fortunately, Sphinx/Shadow of the Second Sun can help, untapping your lands and transforming Emet-Selch before your second main phase

With great card draw and aggro both in the command zone, and enough little creatures to get said commander out early with Convoke, it's fairly easy to start some life totals rapidly declining while also drawing significant portions of your deck to keep the whole thing going through a possible board wipe

Commander damage kills can be a legitimate method of victory, or you can leap ahead of the rest of the table just by virtue of sheer, overwhelming card advantage