You clearly need to be heavy on equipment to use Firion, but assuming you are, it should be pretty strong
One drawback is that your opponents have more combined life than you have cards in your deck, so it's possible to deck yourself out if you hit a combo too early or without a way to throttle it
With the main flow of the deck explained, it is time to move on to how to combo and set up a disruptive board with this deck
Anyway, theyre also a five mana 4/4 with Menace, but the main thing that makes them powerful is their ability
Card Name Shelob, Dread Weaver Mana Cost Type Legendary Creature Spider Demon Rarity Rare rules Text Whenever a nontoken creature an opponent controls dies, exile it., Put a creature card exiled with Shelob into its owner's graveyard: Put two +1/+1 counters on Shelob