This is a really fun deck. I am only playing two of Gitrog Monster.
Drownyard Temple is the best land to sacrifice to Gitrog Monster.
And then you get to draw a card. Evolving Wilds is another land that gets you to draw off Gitrog Monster.
Retreat to Kazandu allowed me to win the game by gaining life 2 at a time when I triggered Landfall.
In this second win, all I had to do was build the bigger army and swing.