This card is an excellent defense against a Lightsworn deck. Since the deck naturally runs many monsters, you will often end the Battle Phase. The extra draws can also lead to the Lightsworn deck running out of cards sooner.
The effect of "Glow Moss" activates before Damage calculation so you can use cards such as "Honest" or "Hedge Guard" depending on the card drawn right after it resolves. Due to the mostly defensive nature of this card, your opponent might not be expecting something like "Prideful Roar" to be activated during the battle, so you may be able to deceive them!