You can, of course, go to a more token-based or kindred-based deck, with a way to go tall with your strongest creature, making one creature stronger than anything else on the battlefield and trample over with equipment and other abilities
Whats worse is that these guys can chain off one another, constantly buying each other back as a recurring threat until they are ready to buy back something of more value
A lord that gives +1/+1 to all Eyes is going to rank lower than another lord that gives them first strike
The drawback is that creature has to have a mana cost equal to or lower than the number of lands you have, but thats super easy to get around in green
There are tons of decks in every format that just dont play planeswalkers or have any responses designed exclusively for them, and I think sieges (and battles in general) will be pretty much the same
Milling not just one, but all opponents for eight cards for only two mana is already decent value, but later in the game, paying the kicker cost mills a massive amount of cards