A repeatable discard at random is definitely nothing to sneeze at, just be aware of the high variance you'll get on the results
If two adjacent drafters both believe they have a good start to black-red, how can we help make sure there are enough cards for both players
In reality, a second- or third-turn Mana Drain often fuelled Mahamoti Djinn, a huge Braingeyser, a game-ending Mind Twist, or any other number of ridiculously accelerated plays
The downside is the opponent chooses which permanent they sacrifice of the chosen type, not you
If the Jeskai route makes the most sense, a 1/1 that should immediately gain you life, and be expendable at the same time fits nicely is a battalion setting
Here are the Top Ten Super Rare and Legendary cards from its first set, The First Chapter