bloomburrow mtg card sleeves Season Lands: Swamp (Summer) Deck Protector (100ct) for Magic: The Gathering exclusive alternate art Bloomburrow - Play Booster Pack

I wanted to enquire that the misty animation and cut scene in fire exit passage is glitchy or you made it that way

Besides that and a few preference choices, I don't see that much wrong with your main deck

Sacrifice after III.) I - Gungnir - Destroy target creature an opponent controls.II - Zantetsuken - This creature gains "Whenever this creature deals combat damage to a player, that player loses the game."III - Hall of Sorrow - Draw two cards

Graveyard synergies, lifegain, and efficient creatures shine here

Since it's a colorless card, it could easily slot into virtually any deck without the player having to make many sacrifices