So long as the card presents a consistent use case for one or two mana, then the more expensive door is easily justified as a situational or late game bonus
from your discard pile to your hand when Hook is played, allowing you to quickly dish out even more damage
The first thing Ill point out is that Ghostly Flicker can (and will) save your permanents from targeted removal
Clearly, there is some built-in synergy between these two mechanics
The big one to pick up for me, though, is Oblivion Sower
You can see the decks' MTG commanders below, but first here's an overview: Terra, Herald of Hope leads the graveyard deck Revival Trance that can quickly assemble a large horde of low-power creatures, perhaps for some aristocrats shenanigans