While green itself isn't particularly well-known for its flying creatures, reach provides you with the ability to stop an opponent from making the most of their fliers
You can think of cards like Thief of Blood and Mikaeus, the Lunarch as counter movers, but thats not actually what those cards are doing in the context of the rules
Laboratory Maniac With a shout out to Jace, Wielder of Mysteries
If you target an Equipment an opponent controls, you won't be able to activate its equip ability, for example, and they can activate its equip ability as a sorcery to reattach it to a creature they control
Players choose a legendary creature as commander for their deck
Where this excels at is as a main phase 2 play after an Overrun to guarantee the lifegain.Worst case scenario, itll fill up your hand easily