You don't have to actually put it in your deck, hell, you might own a copy of whatever monster it is already, but no, you have to win the duel here
Fiendsmith Engraver is arguably the best card in the meta, as it can quickly start a combo by itself without requiring other pieces, making it able to access the engine's powerful link monsters, Fiendsmith Requiem and Fiendsmith Sequence
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Regardless, whether you want to make a deck using these cards or simply want to move some of the better ones into another deck, then this was a good one to start off with
Being able to take out planeswalkers is really nice too although charging Explosives upto four can be a challenge
Floodgate Trap Hole Floodgate Trap Hole is one of several different Trap Hole cards in the game, and years after its addition to the game, it remains one of the more-used Traps in the game