Ruby/Sapphire decks normally have a good amount of removal (outright banishing characters) and ramp (adding extra ink in a turn)
It's potentially very interesting in conjunction with Soulfire Grand Master (Soulfire being a 3 mana play and Spirit being a 4 mana one, to ensure value from their text), but it could also see play alongside Collected Company as an evaisive threat or deathtouching roadblock
It slots nicely into Treasure decks to take advantage of cashing those tokens in for mana, and its elf creature type helps it fit into Lathril, Blade of the Elves token decks
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Pestilent Spirit Pestilent Spirit is an interesting card for these rankings because it grants deathtouch to your instant and sorcery spells
Synergistic commanders for this creature are Blex, Vexing Pest because of its anthem effect of pumping spiders, among others, and Shelob, Child of Ungoliant, the best spider commander in MTG, because it gives spiders deathtouch and ward 2