Yet Another Aether Vortex question

[bedafile]

Do come into play ablilities work when Yet Another Aether Vortex is already in play?

If so when do they happen, at the end of the draw step?

TY

[Slay]

Yes, they occur. They are put on the stack the moment the card becomes the top card of the library, right before the active player gets priority.

Another interesting tidbit: If you have YAAV, R&D's Secret Lair, Memnarch and Karn in play, and an Alpha counterspell is the top card of your library, you can make the counterspell an artifact and attack with it for 2 damage. I think.
-Slay

[Nibble]

Does a revealed card (defined as the state by which a card appears in play as the card above it has been drawn) trigger "comes into play" effects?

No, it doesn't.