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Whenever one or more +1/+1 counters are put on a creature you control, if Moss-Pit Skeleton is in your graveyard, return A-Moss-Pit Skeleton from your graveyard to your hand at the beginning of the next end step

Glenn is so clean a design I expect a Magic version of him to show up somewhere, even though Skulk is unlikely to return outside of a supplemental set

They go back to their owner's hand instead

Not only does this synergize well with mana rocks and other artifacts with activated abilities, but it simultaneously functions as damage-based removal, a means of closing out a game, and a means of digging through your deck for key cards