For example, while it's in your graveyard, Keeper of the Crown is a green creature card with mana value 3
Alolan Sandslash takes 20 additional damage from Metal-type attacks
While she is a five star monster and does require a sacrifice, the protection that she offers is something that every other appetizer is missing, making her the true main course of this archetype.
For the first week of Standard, though, I dont think its needed
The core game plan is to cast a flurry of spells in a single turn, flash them back with Past in Flames, and finish with a lethal Grapeshot
look at your opponent's hand, all monsters they control, and all cards they draw until the end of their 3rd turn after this card resolves, and destroy all those monsters with 1500 or less DEF