The pre-made deck here is all built around strong glimmers that are able to challenge (Mulan's "Reckless" ability forces her to do this each turn if she's able) and gather Lore quickly
(Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Once Lydia Frye has been blocked, increasing the blocking creature's power to 3 or greater won't cause Lydia Frye to become unblocked
Refute Refute is a solid upgrade on Cancel with a loot
Purphoros, God of the Forge, as you can imagine, goes in Impact Tremors style decks, usually in builds that spew Goblins
I cant tell you how many decks I see online and in real life that benefit from a TWest but dont run it
And flavor wise, the Slivers are about evolution, and will often grow extra physical aspects like Two-Headed Sliver or Plated Sliver, so changing their base form is in line with who they are