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While powerful, the drawback of dealing damage to players at the end step could be risky in certain situations

Its the old supply and demand stuff

"Parasite Paranoid" is not part of the archetype due to having no effect connection and the name is different

Rakdos, the Muscle Rakdos, the Muscle is a 6/5 flying, trampling creature for 5 mana, so wheres the downside

Many of the cards in the deck deal with adding these counters, plus plenty of +1/+1 counters to your creatures, so you can bet that there are tons of ways to proliferate all your counters up to even higher levels and to keep your opponents constantly losing life through either combat or radiation