
Momentum is a pretty generically good card for Rogue decks that are planning on overachieving, but I think it bares particular consideration for Parallel "Skids" O'Toole. There are basically 2 reasons for this.
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As a Practiced skill, it can be found by Practice Makes Perfect, which is gambit traited, so Parallel Skids can take it. In general, you're probably trying to dig out Three Aces, but it doesn't hurt to have an alternative choice if there isn't one in the top 9.
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If you commit this to a test that you're way over the difficulty for (a Lockpicks test, for instance) you could reduce the difficulty of your ability by up to 3. This means that you can bet all 3 resources and be nearly guaranteed to double that. Add in Double or Nothing to go from 3 to 12 resources at no action cost.