As a sideboard card, it has a quality that no other card on its list shares: its actually applicable in many different situations, which means it has seen a fair bit of maindeck play as well
If you dont need the aggression, Jeskai gives you a backup plan that draws a card whenever your creatures hit a player, keeping the gas flowing while you keep turning sideways
Players can respond to the reflexive triggered ability as normal, knowing the amount of damage that will be dealt as that ability resolves
Join me next week for the debut of The Lost Caverns of Ixalan card previews
If you're always casting your Commander on turn three, then it means you have a much lower need for a ton of three-drops: your Commander always gives you an option
Consider its card type, any effects that modify when you could cast it (such as flash), and any other effects that stop you from casting it (such as from Meddling Mage's ability) to determine if and when you can do this