Dealing 5 to a creature is cool when you want that, but you rarely care about that as a red deck
she buffs herself, keeps the summons in play longer, and lets their effects retrigger
Edgar must be on the battlefield or in the command zone when you cast another Vampire spell and also as the triggered ability resolves
For example, what is the set's budget, how much new art it has access to, what raw materials can it access, what printers can it use, etc
Vivi can be hard to keep in play due to his notoriety (he did terrible things in Standard) but on the bright side, his mana cost is so low that it shouldn't be too hard to bring him back
Gold is the more abundant currency, and will generally be earned by completing daily and weekly quests and filling out the battle pass (of which there is a free and premium version)