Having Llanowar Wastes in the format means that colored mana is as good for aggressive decks as it was last summer, back when my G/R Aggro deck from the World Championships took the format by storm
It has become a staple in Commander and was recently banned in Modern due to its dominance
To take advantage of its need to see your opponents bleed, running other Bloodthirst-y cards, like Petrified Wood-KinPetrified Wood-Kin, Furyborn HellkiteFuryborn Hellkite, or some spectacle cards like Light Up the StageLight Up the Stage, add some good support
Sadly, I don't see any way of nerfing this deck without killing it off entirely
You're paying 25 for a pack that might contain 30 worth of cardssounds good, but you need to actually sell those cards to realise the value, and that introduces friction, fees, and time
Its a menace body to help get Isshin triggers, and it generates plenty of value