Kokusho, the Evening Star Formerly a Commander staple that saw competitive Constructed play, too
The most numerous green creature type is elves, so these lands will fit this strategy nicely
Once per turn, during the End Phase: You can make all monsters your opponent controls lose 1000 ATK, also if your opponent controls no face-up monsters, inflict 1000 damage to your opponent
It also gives all of your Plants and Treefolk +2/+0 (strange that Treefolk are included in this, since they usually prefer a boost to their defenses) and at the beginning of your postcombat main phase you can return a Plant, Treefolk, or land from your graveyard to your hand

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cards (with some exceptions, such as "Different Dimension Dragon")