On to the activated ability, is a nice easy cost, and while the nonlegendary clause is sure to nip at you a couple of times for interactions you would love to have, there are lots of excellent targets for Niko to flicker and result in three or more extra white or blue ETB effects, just look at Karmic Guide, Trinket Mage, and Junk Winder
The ability that defines Adeline's power works in all zones, not just the battlefield
(See rules 800.4a and 800.4c.) If a phased-out permanent phased out under the control of a player who has left the game, that permanent phases in during the next untap step after that players next turn would have begun
The main purpose you want to abuse the beginner decks is because they are useful at giving your rewards, primarily the daily quests that need you to complete certain tasks
Well, at least the first half
The Pit Fun: 3 Impact: 3 Chaos: 3 This, I like