Unless the attacking creature leaves combat, it continues to be a blocked creature through the end of combat step, even if the creature or creatures that blocked it are no longer on the battlefield or have otherwise left combat by then
It's a spell that destroys all creatures or spells that forces a player to sacrifice
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If you bring a creature to the battlefield during the opponent's turn (for example, Teferi Mage of Zhalfir), and the cunning opponent phase it out, Teferi will phase in at the beginning of your untap step, and you can attack with it during the same turn
The funny thing is, Gandalf must read one of his scrolls whenever you cast an instant or sorcery spell whether you want him to or not, and one of the scrolls has Gandalf putting himself on top of your library which is the perfect place to restock his supply of scrolls for when you cast him again