mtg control commander deck Masters CMM Commander Decks The Gatherings most popular multiplayer format Elite Blue Black Control Dragon

If not a reskin, I would bet this is the artwork for a board wipe in the set

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It can't be, say, a glass of water

Yes, Walking Ballista has its own self-replacement effect that modifies how it enters the battlefield: Instead of just entering the battlefield, it enters with X +1/+1 counters

Because It Came from Planet Glurg doesn't target you can also copy any creature on the battlefield regardless of having hexproof or shroud