Another thing that makes aggro creatures great is when they come with a little extra, like a strong enters ability or a passive effect that adds value over time, like Voice of Victory, Agent Bishop, Man in Black, Luminarch Aspirant, or Nishoba Brawler
There are some sweet cards out there that can give you extra value, and there are a bunch of similar-to-the-best-in-slot options that might screw your deck less if an opponent steals your spell
Your deck did exactly what it was supposed to do, and you came out on top
You may cast a spell with mana value X or less from your hand without paying its mana cost
This is a triggered ability that goes on the stack immediately after attackers have been declared in the declare attackers step
I think Tristan playing Glorybringer is a bit ambitious and that you certainly dont want six colorless lands, but the raw number is right