These digital invites can be used to invite friends of your children to the party
Sliver Hivelord guarantees your slivers stay safe even if your opponents try to stop you
It's not very difficult nowadays to go find some booster packs at a big box store
Since it's an instant, you simply pass your turn, wait until your opponent's upkeep, and then cast it, which is very close to getting an extra turn (the main difference is that your opponent will get to untap)
It's also better in multiplayer where you can end someone not attacking you or other blockers
If you have Bolass Citadel on the battlefield and you hit Gray Merchant off it, its at least going to be a free card, and at best its going to fuel many more cards that turn, potentially leading into a win right there and then if you hit a second Gray Merchant