I can definitely see Plaza of Heroes tapping for 5 colors quite often in a deck led by Sisay, Weatherlight Captain while also doubling as a way to protect her from removal
Survival is still decent in a selection of creature heavy midrange decks where you have utility creatures, late game finishers you don't want early and ramp dorks you don't want late
Plus, if you build a deck that has cards such as Font of Mythos in it, this increases in power significantly
and , which means "Pond" - we'll call it "Blue" just to stick with colors
Weakness WWaterx2 Resistance DDragonone Retreat CC
Unreleased tip: On your first runs, start with a returning class (Ironclad/Silent) to transfer STS1 patterns, then deliberately sample both Act-1 Alternate Acts to learn which relics/cards spike in each environment