And while land denial is never the most fun, it's possible that now is actually a time that punishing ramping mana bases full of Triomes and dual lands is actually a bit heroic
They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack
Such wanton destruction left to the fire-fuelled antics of the Red deck, but White in Theros: Beyond Death seems to represent the wrath of the gods as much as it does their healing life force
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I dont think theres a huge need to cast Radiant Flames out of the sideboard for three so Im not playing a third color of mana, but if there is a good reason, you could get by shaving a Forest for a Canopy Vista which is fetchable by all of the lands