If you really want to ensure that the Guardian wins you the game, make sure to run a few lifegain effects and lifelink creatures so you can increase your life total
Wilds of Eldraine Commander Deck Virtue and Valor spoilers Commander Ellivere of the Wild Court Befitting the decks green/white identity, Ellivere is focused on buffing and swarming with multiple creatures
1 Dwynen, Gilt-Leaf Daen Grows Elves, Gain Life There are a ton of powerful Elves available in Pauper Commander, and Dwynen, Gilt-Leaf Daen gives them all a minor stat boost
Your opponent may have the means to block your attacker, but if their defending creature is valuable and they think you have the means to take it out, bluffing a combat trick or interaction can give you a couple of free hits
It's flavorful, generally useful, and is nipping at the heels of being evergreen like Treasure
And how effective would a 10-turn Doom clock even be in an average MTG game