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Exile any number of target creatures and/or planeswalkers you control. At the beginning of the next end step, return each of them to the battlefield under its owner's control. Each of them enters with an additional +1/+1 counter on it if it's a creature and an additional loyalty counter on it if it's a planeswalker.
Use the characteristics of each permanent as it returns to the battlefield to determine if it should enter with an additional +1/+1 counter, an additional loyalty counter, or in very unusual cases, both. Notably, if you exile a creature that was only a creature because of a type-changing effect, it will enter as a noncreature permanent and won't get any additional +1/+1 counters from the effect of Semester's End.
