Mulligans
General Mulligans
Minefield is great to control the board in the first 3 turns
Focus on getting the Harbor Scamp to draw the 5 cost rush and use Outrider's Axe to draw and clear
Aggro Mulligans
Iceblood Garrison and Minefield is necessary to keep board control
Keep Frozen Buckler so you can trade Heavy Plate freely
Outrider Axe has good durability and draw
Lord Barov has great synergy with many spell we run to clear
Midrange Mulligans
Probably only Midrange deck is Libram Paladin so keep their board in the early turns under control and hope for the best