If the player to your left is drafting a Black/Green Infect deck in front of you and they pass you a couple Carapace Forgers, you can draft a Green/Red Metalcraft deck with the two Forgers as your only Green cards, a couple Red removal cards and a ton of artifacts
There are 10 rares (11.5%) from the Beginner Box that can be found in these slots
For example, three Azorius leaders cross the 1000 threshold - Brago, King Eternal, Bruna, Light of Alabaster, and Grand Arbiter Augustin IV
Notably, this means a Sieges controller can attack it
Giving an opponent a 2/2 is very neglible
After it triggers in your upkeep, you can look at the top card of their library and you can cast it with your mana as though it were mana of any color, so if you flip over Lightning Bolt you can tap an Island and cast it