If your deck is particularly recursive, Altar of Dementia can act as an alternate wincon by milling your opponents out
So, I think there are plenty of supporting cards you can fill out a mono-red deck if you want to consider building around Marton Stromgald
UchuulonUchuulon is a really good example as it gets bigger the more Horrors you control, allowing you to mill more cards when it hits your opponents which in turn, lets you to use its second ability more consistently to make more copies of UchuulonUchuulon
TAUC DIRTY TO ME If youre building around these tap-an-untapped-creature mechanics in Standard, then that might already be as far as you need to go
thanks @wizards_magic, you have no idea how good I am at last minute c?h?o?p?p?i?n?g
Play it on turn two, back it up with removal like Galvanic Discharge or tricks like Wing It, and snowball to victory