If you must relegate Abaddon to the 99 of a deck (and let's be honest here who could relegate Abaddon the Despoiler of all the beings existing in Warhammer 40,000 to the 99?!), we think the only real choice is Yidris, Maelstrom Wielder
For just 1 mana, you can lock an opponent out of casting spells for a turn, and with kicker, it even prevents attacks
Green | Tendershoot Dryad Honorable Mention: Scute Swarm Green is probably one of the colors with the most access to token generators in MTG, so the best card in this category carries a lot of weight
In addition to the massive amount of card draw he provides (possibly even better than Tatyova, Benthic DruidTatyova, Benthic Druid, or similar Simic value commanders), he gets bigger