The ability to play a three-mana spell on turn two has been a cornerstone of greens identity since the games inception and has secured its place in nearly every format where it has been legal
At worst this is 3-mana exile-a-threat
A major source of mana throughout the game will be the previously discussed cost-reducing permanents, but those are slow sources of value
The Meathook Massacre Part sweeper, part aristocrats payoff, The Meathook Massacre is a very strong and flexible black card
This could easily go in any big green Commander decks
Polukranos, Engine of Ruin Color Indicator: White and Green Legendary Creature Phyrexian Hydra Reach, lifelink Whenever Polukranos or another nontoken Hydra you control dies, create a 3/3 green and white Phyrexian Hydra creature token with reach and a 3/3 green and white Phyrexian Hydra creature token with lifelink