Challenging will become more common Although quite likely new cards will come out that eliminate Locations in play, until those are announced we dont right now know about many ways to get rid of locations other than to challenge them
While five-color Commanders have it a bit better than colorless Commanders, there are still only around 50 of them in the entirety of Magic: The Gathering
And of course, not everyone can obtain or even get close to any of the cards on this list
"You do not have to have a retail store
Whenever a player loses the game, if they were attacked this turn by an Assassin you controlled, you win the game
Him being flying certainly helps, as well, although it's really more the first part of the equation that brings people here most often