Once your landfull/card draw engine is running (with Tatyova drawing you a huge number of cards as lands keep hitting the battlefield), cards such as Sylvan Awakening, Avenger of Zendikar, Zendikar's Roil, Ominous Seas, and others will provide you with powerful ways to generate creature tokens and overwhelm your opponent
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Ah, poor Fblthp
However, that isn't a reason to not use Seething Song in Commander, as the average Commander game will last far longer than a match of one versus one Modern
If it were common itd be awesome
Extra counters means extra protection