Span of a Couple

Put two prowess counters on two target creatures.
(Whenever their controllers cast a noncreature spell,
that creature gets +1/+1 until end of turn twice.)
If you control both creatures at the beginning of
the next end step, remove all counters from them.
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"It's real, isn't it? It's not a joke? My sister says you
are lying to me."
"It's real for us" he said. "Not for her."