There were two Standard Grand Prix events this past weekend, in Providence as well as Kuala Lumpur
I know that Golgari life gain is supported enough that this is less off-beat than some of the other decks proposed, but this article is already long enough without me including a section arguing for and against each of the options
Once a creature has been blocked, its considered blocked until the end of combat, even if it gains unblockable
However, if Tenth District Hero is a 5/5 legendary Human Detective named Mileva, the Stalwart with vigilance and "Other creatures you control have indestructible" and you activate its first ability again, it will become a 4/4 legendary Human Detective named Mileva, the Stalwart with the same abilities, plus an additional (and almost certainly redundant) instance of vigilance
If, on the other hand, you want some sleeves for storing in a binder, what you need are perfect fit sleeves
Well, we're on the plane of Ravnicabut this set isn't about guilds