You could easily cast Kenrith even if you dont already have all five colors, and still make use of just a few of his abilities until you get all five colors online
Once all the picking is done, players must also construct their decks within a certain frame of time, maximizing power and consistency from a vastly underpowered card pool when compared to Standard
Since you generally need land to cast most of your spells, getting rid of them can hamper your opponents substantially
Chandra, Dressed to Kill For 3 mana, Chandra, Dressed to Kill is essentially a fragile mana rock that doubles as card draw, and if you protect her long enough then you get an amazing bonus payoff
Sacrifice it for that sweet sweet card drawing action
I would recommend playing removal spells with cheap mana costs and take ward into account when planning your future turns