Archon of Cruelty quickly found a home in Legacy reanimator decks, where you can use cards like Entomb to put it from your library into your graveyard, and then bring it back in the same turn with Reanimate
A nice aspect of Lathril is that its saboteur ability is tied to the amount of damage, so you can buff Lathrils power with elf lords, equipment, or something very specific like Immaculate Magistrate or Timberwatch Elf
Generally, the weakest cards are Cartouche of Solidarity (against decks that dont have Edict effects, Ancestral Mask, Abundant Growth, and the singleton Lifelink (against decks that are not beatdown where we bring in more Lifelinks)
While Im no multi-billion dollar hedge-fund manager, I have a lot of common sense knowledge that eludes many retail investors, and certainly most Yu-Gi-Oh