Dont get bogged down on the exact terms and phrases
White was the color of the army and thus had more creatures so there was synergy, but green was the color of large variable creatures, of which this was a subset
For example, Llanowar Tribe, Goreclaw, Terror of Qal Sisma, Steel Leaf Champion, and the like make the most of Ghalta's ability to reduce her cost
Red removal spells such as Lunge and Shock Troops were turns too late to keep the Bouncer offline, and so a smart player could basically keep his Bouncer around indefinitely, use it to dominate the board, and ride it straight to victory
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Overlord of the Hauntwoods Overlord of the Hauntwoods is a strong green card