The English version of this card is missing “this turn,” but the Chinese version includes it. Which is correct?

The English version is a printing error. Convergent Mutation will receive errata to correct this oversight. Meanwhile, the Chinese version uses “becomes” language where the English version uses “increase.” We have opted to keep the “increase” wording from English, as these wordings work slightly differently [Reaction] (Play any time, even before spells and abilities resolve.) Choose a friendly unit. This turn, increase its Might to the Might of another friendly unit.

Related: Convergent Mutation