If you copy your own legendary permanent, you usually just created a brief administrative problem you must immediately solve by choosing one to keep
Arahbo, Roar of the World Commander 2017 is widely reviled for the introduction of the eminence mechanic, which lets commanders like Arahbo, Roar of the World affect the battlefield from the command zone
When that happens, it's important that your opponent doesn't win
A six mana investment on the front is well worth it, particularly as you can get him in for damage, pitch a spell to Connive, and flip him on the same turn
Cloudpost is basically an upgraded version of Tron that is easier to assemble (you don't need three different lands to get the benefit) and can make even more mana (three Cloudposts make nine mana, while Tron makes seven), with the drawback being that the lands come into play tapped