I actually put Snapcaster Mage on 5 and think the card is a little underplayed especially in combination with newer cards like Counterspell, DRC, Unholy Heat and also Lurrus of the Dream-Den
Normally, Ghost Quarter and Field of Ruin are ways to keep degenerate lands (like Tron) in check, but in conjunction with Leonin Arbiter, they turn into Modern-legal imitations of Strip Mine
Kumano Faces Kakkazan is a one-mana Red saga that deals one damage to each opponent and their planeswalkers the turn you play it, allows a creature you cast to enter the battlefield with an extra +1/+1 counter on the turn after, and then transforms on turn three
You choose a noncreature, nonland card from it
Legacy: The gold standard for balanced limited play for over two decades
As such, none of the featured builds in this list are splashed with red, despite many great red Phyrexian cards being ready and available