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The Summon Limit is a hard cap on what can be accomplished in a turn

They must discard a card, or watch you place a Construct, Robot or Vehicle onto the battlefield

Once per turn, if this card battled this turn (Quick Effect): You can return 1 card equipped to this card to the hand, then immediately after this effect resolves, Xyz Summon 1 WATER Xyz Monster

and Devour for Power, featuring The Mimeoplasm as the Commander

it can be used to make space to Special Summon more "Mekk-Knight" monsters, and, if either "World Legacy Key", "Secret" or "Whispers" is active, can disrupt the opponent's plays by moving a "Mekk-Knight" to the same column as opposing cards

This is a completely legal thing to do, even though it seems strange