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
Promos (P) Promotional cards - like the aforementioned Lightning Bolt from MagicFest - can come from events, prereleases, special products, store promos, conventions, Secret Lair drops, and various other places where Wizards know we players are willing to pay top dollar for them
We still didn't have anything approaching a "set file," but as someone who is more used to designing for Limited, I wanted to test our mechanics in something that felt like the games of Limited I was used to
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