Well, I guess I have to elaborate further
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from the Fallout Universes Beyond set, it could benefit from a few extra synergy pieces but it's a good introduction to energy, and fits Aetherdrift's focus on speed and machinery well
A deck that focuses on sacrificing its own creatures for value, such as a Black sacrifice deck or a token-based strategy, would benefit from Grave Pact as it can create a strong board advantage by forcing opponents to sacrifice their creatures
Universes Beyond has already touched on some really big IPs with The Lord of the Rings
This cards name is perfect, as it extracts a tithe of a Treasure token and a possible card to play from the top of an opponents library whenever your creatures deal combat damage to that player