There's incredible variety for budget Commander players, from aggressive strategies to controlling and everything in between
To that end, I think the decision will ultimately come down to how relevant the sacrifice ability is on the card

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Even though its 1/1 Skulk creature with no mana cost in the top right, Persistent Nightmare has a converted mana cost of four (2UU)
Preventing damage and getting indestructible seems a little redundant, but it protects your planeswalkers
Raph & Mikey, Troublemakers The only reason Raph & Mikey, Troublemakers are stuck in this tier is a high casting cost