Sacrifice after III.) I Exile target creature an opponent controls with power 3 or greater
For example, if you choose protection from Demons and from Dragons (totally counts), you can't choose protection from red later that day
All you need to do is play Soul Warden on turn one, and youll have a 4/4 as soon as you play Karlov
What competitive formats is Door of Destinies played in
You're going to have to play a lot of cheap characters to keep up with your opponent early in the game, and Friends on the Other Side will help you keep your handed loaded while you wait for your key cards to appear
Foundations is intended to be a return to the basics, making it easier for new players to really get a handle on building decks, playing different formats, and learning the game