Until end of combat, you don't lose this mana as steps end." Mana from firebending abilities isn't lost until you leave combat and go to your second main phase
An ability that triggers "whenever you waterbend" triggers whenever you pay a waterbend cost, regardless of how you paid that cost
Its cheap, easy to use, and in white, filling your graveyard is something you actively want to be doing most of the time, to take advantage of whites great recursion pieces
Id suggest picking a copy up
Olivia, Crimson Bride Vampires are seen as sexy Halloween monsters and Olivia could have been designed to fit that bill - if she weren't basking in blood instead, that is
While the race-themed cards that hearken back to Aetherdrift arent top of my list, theres still a lot to love