He can be a real thorn in your opponents side if you can quest with him on turn three, and block potential challengers
In my experience, packs have one common card of each of the six ink colors, and more cells let you separate cards of higher rarity by color as well
The first combat phase language makes it sound like you can only get a single extra hit, but combat damage to a player means that if you successfully damage all three opponents with creatures that are strong enough, this triggers separate instances
Youre choosing speed over comfort, and the drawbacks come with it: the damage adds up, the untap cost is annoying, and if the game goes long it can feel clunky
Multiples will also stack neatly on your shelves to keep your cards together
It provides a win condition and stalls the game as you block your opponents creatures forever