Ulvenwald Observer is the typical big, bulky creature that green favors, but whenever the player that controls has a creature with toughness of four or greater die, they get to draw a card
I really like it in decks that care about sacrifices like Dimir Zombies, especially post- Midnight Hunt that may have fun decayed Zombie tokens to sacrifice
And don't feel constrained by these options - there are plenty of cEDH decks outside of the top few that can bust out an MTG combo and pull off a win
You can earn covers of each terrain: Untouched Forest Collect 5 of the following cards, which can include duplicates: Chatot, Venipede, Liepard, Mankey, Joltik, Shiinotic, Exeggutor, Raichu
This Snow White can help you with that
Land-search spells like Cultivate, Kodama's Reach, and Three Visits build a permanent mana base that survives board wipes unlike artifact or creature ramp, lands virtually never get removed