An easy upgrade for people playing Tuvasa the Sunlit, Hanna, Ships Navigator or even the more recent Alela, Artful Provocateur
Yes, there are builds where you can stock your graveyard up, but Im thinking you could reanimate this blue creature with something like Unearth or Helping Hand, or play it in a tempo build and cheat it in without casting with something like Collected Company
Finally, Olivia has haste, which allows her to attack immediately after being played without waiting a turn
Five Mega Evolution Pokemon ex headline the set: Mega Lucario ex, Mega Venusaur ex, Mega Absol ex, Mega Mawile ex, and Mega Camerupt ex
If the third mode is chosen for Silent Hallcreeper's last ability but the target creature is an illegal target as the ability tries to resolve, it won't resolve and none of its effects will happen
This sounds like a wait for another set of cards problem