That's the basics of the Pokmon trading card game
Once your Humans are all in play, you can clear the battlefield with Taunt from the Ramparts, goading all your opponents creatures and preventing them from being able to block, opening the way for your creatures to sweep through
Again, no point in struggling when this can help
This is by no means a practice I believe should be used in every set, but I think invigorating a tribe like mercenaries and allowing players to discover that Doomed Necromancer is itself one, can be a fun moment that rewards deck builders taking the time to look for hidden gems
Survival- At the beginning of your second main phase, if Cynical Loner is tapped, you may search your library for a card, put it into your graveyard, then shuffle
New vendors = New Inventory