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
On one hand, your opponent might be playing them as well, making them a liability at worse, and a game of chicken at best
Realmwright gives you a turn 1 fixer, which can be quite important
The treasure tokens are wonderful for being ahead of the curve, and with this card, you can now have even more powerful creatures earlier
Lightning Skelemental, a devastating combination of Ball Lightning and Blightning, presents an incredibly aggressive card that may be aggressively costed enough to see play in Modern
But Jace, the Living Guildpact comes close to its ultimate and blue is the color of proliferation, so its very achievable