My opponent's level 4 Digimon was played by an effect, then this card's [All Turns] effect and another effect triggered simultaneously. I activated the other effect, then the level of the Digimon that was played by an effect increased from 4 to 5. If I then activate this card's [All Turns] effect, what levels of Digimon can I play?
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Level 4 or lower. If the same reference to a "played" trigger condition being performed is made for an effect when it has a "when X is played" trigger condition, the state when the effect has triggered will be referenced. In this case, your opponent's Digimon was level 4 when this card's [All Turns] effect triggered, therefore you can play a level 4 or lower Digimon.
Source: EX5-060 Dragomon