The Ninja will deal combat damage during the regular combat damage step, even if it has first strike
(Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Once Lydia Frye has been blocked, increasing the blocking creature's power to 3 or greater won't cause Lydia Frye to become unblocked
This is because a truly great card will see play across multiple formats, and thus keeps some level of value across them
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) , , Sacrifice another artifact: Proliferate
It's put into the graveyard from the stack, not the battlefield, so its last ability won't trigger