In D&D, you, the player, are the one leveling up, not your creatures fighting alongside you
Since they are triggered abilities, chapter triggers do go onto the stack
Each symbol represents the rarity of that specific card, and you will usually be able to spot these symbols on the bottom of the card, generally at the bottom right corner, but sometimes on the left as well
The obvious upside for Amulet Titan is Aether Gust as an answer to Blood Moon, as well an answer for all the land destruction that is worse than Blood Moon
// The Lord Master of Hell Legendary Creature Demon Noble Wizard 3/3 Starfall Whenever The Lord Master of Hell attacks, it deals X damage to each opponent, where X is the number of noncreature, nonland cards in your graveyard
What's worth remark here is that their monsters' low ATK doesn't get in the way of their strategy, as can the deck focus a lot on interruption and thereby mitigate the need to close games quickly