Here are some good Nethroi targets that have low power but make tokens or have good effects when they enter: Biogenic Ooze Blade Splicer Master Splicer Maul Splicer Sensor Splicer Noosegraf Mob Chittering Witch Creakwood Liege Akroan Horse Pentavus Deep Forest Hermit Deranged Hermit Nut Collector Duplicant Geist-Honored Monk Ghave, Guru of Spores God-Eternal Oketra Hornet Queen Izoni, Thousand-Eyed Tendershoot Dryad Trostani Discordant Trostani's Summoner Most of the above cards create creature tokens, so you'll probably want the usual: Doubling Season, Anointed Procession, Parallel Lives if you include a lot of them
You can drop them early or free any time to break folks faces, and good free stuff is always good, but many in Commander might go with the 4/4 Wurms first in a Commander brew with 40 life to get too and trample too
3 and Garland, Knight of Cornelia Black Mage Aggro is WotCs title for this one, but Id classify this as more of a bleeder archetype if anything
The ability also triggers if our opponent targets it with a spell, which makes it somewhat resilient to removal
The reason that the card costs so much is that it is pretty much the number one most iconic creature from Magic during that time, with Serra Angel an easy choice for second place