Strong magnetic closure keeps everything secure
This is the goal to aim for since it maximizes your profits, but instead of being my sole strategy, I look at local sales as a nice bonus when they happen to work out
Intrepid Outlander is a great two-mana creature with great stats for its mana cost, but it'll be hard until later in the game to trigger its Pack tactics ability and venture into the Dungeon
Just take a look at Mews Genome Hacking ability
Both in price and functionality, Final Act underperforms, with the difference between the exile and destroy effect being too vast
I would personally cut the Saheeli - you might not know this as a returning player but planeswalkers without any dedicated support aren't typically worth running in commander unless they have an immediate impact on the game (something like Ugin, the Spirit Dragon for example )