Its effect is deceptively simple: all non-basic lands are now ordinary mountains
Other cards, such as Sheoldred, Whispering One, can be great for the fact that they continually mess with opponents: old Sheoldred allowed you to return a creature card from your graveyard at the start of your turn, meaning that reanimating her likely nets you free continual reanimation while shes on the field, and ALSO makes your opponents sacrifice a creature during their upkeep, getting around hexproof, indestructible, or other removal resistant barriers
This allows you to install the APK file
Then the frog drains your opponents for each enchantment you cast with it out
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While ninjutsu is an activated ability and it might make sense for Cursed Totem and other stax pieces to stop the mechanic, the ninjutsu card isnt on the battlefield