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This isn't the only way to do the Combo - sometimes you already have Magician/Souls in GY, then the other monster can be arbitrary, or you do the combo without Sheep, then you need one additional material, or you have 2 Endymions, etc

But if you're both using different color sleeves, then the card is going to stick out in your opponent's deck like a sore thumb

The Bewitching Phantom Thief

Worst of all: It was wasting a sideboard slot

Once per turn, when your opponent's monster effect is activated, or when an opponent's monster declares an attack (Quick Effect): You can activate this effect

If done right, it can create a better alternate playstyle