If you build your deck to put creatures into play and attack your way to victory, you will do more harm than good by taking out eight aggressive creatures to add in sideboard cards if they aren't creatures
Your opponent will control your creature, but it's still a commander that you own, so your background still applies to that card, even on another side of the table
The Herald is useful with cards like Nine Lives that will normally cause the game to be lost when the card leaves the field, allowing the player to circumvent those tricky downsides
The rest is history, and its one of my favorite graded cards in my collection
Because this entire deck is indestructible, nothing will happen to any of the players permanents when Worldslayers ability comes into play
This means that, even if you have seven cards in your graveyard when you first cast the spell, if you lose cards from your graveyard before it has resolved on the stack, like through paying escape costs or a well-timed Tormods Crypt, you could fail to meet the threshold by the time it resolves