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First, dont be afraid to sacrifice your persist creatures to effects like Scarecrone or just use them as blockers

Many viable Rakdos Commanders are available due to a large card pool, each with pros and cons for deck construction

[ Monster Effect ] If this card is sent to the GY or added to your Extra Deck face-up because it was used as Fusion Material: You can choose monsters on the field, up to the number of monsters you control, and place 1 Predator Counter on each one, and if you do, any of those monsters that are Level 2 or higher become Level 1 as long as they have a Predator Counter

Type: Null (Crimson Blaze) is not available in Regular Packs

Plus, its almost free to add to a deck that requires key threats to be protected from spot removal, so your commander gets harder to kill if you have a few untapped creatures laying around

From there work through your deck for some way to either remove your deck with a card like Tainted Pact, or mill yourself with Brain Freeze and win off a Laboratory Maniac