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Rather the two seem like they are 2 different issues

This can happen if you control a permanent, like Vorinclex, Monstrous Raider, that doubles the number of counters a permanent enters with

Upgrade 8 Lich-Knights Conquest gives you mass recursion with all the tokens you can generate, and you can exchange your tokens for all the creatures that have previously died

While upkeep effects on their own are powerful, with doublers like Obeka, Splitter Of Seconds and Paradox Haze, they can be even more devastating in a Commander pod

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Effects that modify a creature's power and/or toughness, such as the one created by Blazing Crescendo or a +1/+1 counter, will apply to the creature no matter when they started to take effect