It remains exiled with no time counters on it, and it's no longer suspended
While it is probably good enough in a deck that is built on the theme of +1/+1 counters, outside of this very specific archetype, adding a single +1/+1 counter to a creature just isn't enough value (even at instant speed) to make me add another tapped land to my deck, especially considering that green already has five MDFCs that I really want to be playing
1 Cultivate
In other cases, youll have to make room for it by cutting other cards
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However, if no creatures have died under your control so far this turn as your end step begins, the ability won't trigger at all