As you look forward into the future with this deck, you can set up for swingy attacks with Commander bombs like Overwhelming Stampede or to keep your creatures safe from harm with one of the best protection spells in the game, Heroic Intervention
Both sides of Valki are excellent, with Valki being hand disruption useful in the early game to steal a powerful creature (with the potential to turn into it later), while Tibalt is a great end-game card, capable of removing multiple creatures and stealing cards from your opponents' libraries to cast yourself
While Heliod doesnt give us as much stuff that we actually want as Purphoros, he does give it to us at a good rate
Momir Vig gives you a tutor and can be triggered multiple times in a turn, but Rashmi always either draws you a card or lets you play a spell, sometimes on your opponents turn
A discard deck is a deck that has multiple effects that force the opponent to discard, and some discard payoffs that trigger when that happens
Skewer the Critics can deal three damage to any target