That said, Id prefer a commander with more than a single ETB effect, especially if that effect wont be too impactful until later in the game
Early Harvest Early Harvest shines as a powerful green ritual
If your opponents keep removing her on their turns or clogging the board with Creatures that can trade profitably, your army never really gets the chance to grow
If you're looking for a more aggressive deck that can fill the board with lots of cheap characters, including the Seven Dwarfs, Tactical Teamwork has plenty of go-wide potential, with more than a few combat tricks up its sleeve too
If your original idea is an ability, try to figure out what loyalty costs it would have on planeswalkers with different converted mana costs
Honorable Mention #2 Extra Combat steps aren't important to everyone, but they are to a lot of people