If it's something that we don't want you having multiples of in most games, we won't put it at common
A few of them have an optional scene or sidequest or the like, but outside of those, anyone who joins permanently will never say another line of dialog again, nor will their presence ever be noted by anyone else
Storm, as a deck, is a spellslinger deck
For 2 mana, you get Sharuum on the battlefield AND you get to trigger your other creatures cool ability
I suppose theres also some convoluted combo involving the ability that creates a Dragon, Mana Echoes, and infinite combat steps
This instant destroys a creature and makes two half-sized copies , allowing you to dodge other removal effects and get more Deadpool