There are plenty of other low-cost cards which can replace Wooded Foothills in this example, not just other lands like Krosan Verge (obviously better if youre also playing white), but spells like Natures Lore or creatures like Wood Elves
Introduced with Elvish Farmer , Feral Thallid , Fungal Bloom , Spore Flower, Thallid , Thallid Devourer , Thorn Thallid in Fallen Empires
On the other hand Sethron, Hurloon General does not care about discard at all, but with the Minotaur token generation, having more attacking Minotaurs, buffing them and giving them evasion (with menace) and haste, can serve better a main aggro strategy where discard and menace are subthemes
The keywords chosen were all ones that interacted with the power/toughness boost
Three-mana 1/3s just aren't going to cut it, especially in a world of actual Bolts