With one to two sets remaining, it might be time to pick up copies of these cards before their supply dries up and make them harder to find
So for example, Sheou is just House rearranged, and this trend follows the rest of the other dragonmaids
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Since you're working with many "when this creature deals damage to an opponent", you may want to place some double strike effects on them, Assault Strobe or Psychotic Fury if you're going for the early impact, which seems like you are, looking at your deck from mostly a ramp-oriented player's point of view, or high later impact cards, such as Berserkers' Onslaught, Rage Reflection or World at War.Cast Through Time could also be considered, if you're going for the constant multiple targets-hitting, or by just being a good card overall.
It gains "When you don't control a legendary Vampire, exile this creature." Whenever Olivia attacks, return target creature card from your graveyard to the battlefield tapped and attacking