Trainer Challenge will likely be your first stop, as it presents a series of AI challenges with different conditions and increasing difficulty to help new players ease into the online game
Duelist of the Mind Nathan Steuer's player spotlight card Duelist of the Mind is an underwhelming blue creature
Milling started on an artifact, and as such much of the follow-up milling effects were also put onto artifact cards
You can play Tevesh Szat, talk your way out of getting beat up early, play a Propaganda to discourage aggression, tutor up Deepglow Skate and then ult Tevesh Szat long before your opponents thought they had anything to worry about
Binder Collection (5 boosters, Zekrom/Reshiram album)
If the rewards are good, we can expect an increase in methods to maintain a favorable board position and/or not suffer so much for 1-for-1 trades with other people's removals