Its activated ability, letting you sacrifice it to put a stun counter on a tapped creature, gives blue decks an uncommon form of removal-like tempo , preventing key threats from untapping for multiple turns
If you want to play a longer more mid-to-lategame style deck in Mono Red that interacts more with the table, well, it gets more challenging because it makes Mono Red's inherent weaknesses more glaring: subpar card draw and ramp, subpar answers to creatures, minimal options for enchantment removal, commander protection, and recursion, things that get more pronounced as the game progresses
Moxen are some of the most powerful effects in Magic: The Gathering capable as, essentially, functioning as lands that dont eat up your one land per turn count
All cards are in the bottom five in EDHREC popularity for new cards in each year of decks