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Even if you have no other counters in play when you bring out your Contagion Engine, it provides a large amount of -1/-1 counters which you can then multiply using its proliferate effect

7 Pendulum Powerhouses: Dragon Horn Hunter And Sky Dragoons Of Draconia Thanks to the dual benefits of Pendulum Summons and effects, adding Pendulum Monsters will take your Normal-centric deck to the next level

CR COLLECTOR'S RARE R Rare Invader of Darkness X DARK Level 8 [ FiendEffect ] ATK 2900 DEF 2500 Your opponent cannot activate Quick-Play Spell Cards

It offers all the goodness of a Careful Study early yet has far better scaling into the late game