If theres a specific card that you want to add to your deck, you can usually buy it from online markets or gaming stores
"If only I could go back in time I would spend all my money and buy 10 Tarmogoyf when it was first released, I would be rich now"
Consider that Murderous Cut cannot prevent a creature like Siege Rhino from triggering its ability when it enters the battlefield, it cannot kill a Planeswalker, and it cannot stop an instant or sorcery
As you can see there are plenty of red and red-leaning cards if you feel like one combat per turn is just not enough
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But given the nature of the card, dead late, terrifying early, it's a no-brainer that 3 would still be the preferred number if legal