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What happened there

Monster Effect: You can discard this card

C Common Commander Covington X EARTH Level 4 [ MachineEffect ] ATK 1000 DEF 600 You can send 1 face-up "Machina Soldier", "Machina Sniper", and "Machina Defender" you control to the GY

Though there are ways to guarantee getting hold of certain cards in products such as Starter Decks, for example, which are pre-constructed and always have the same selection of cards but for the most part, players will be at the whim of chance when opening a booster pack

To stop this being completely broken, your other monsters cannot attack for the rest of the turn

Based on your observations, adapt your strategy