While there are tons of Roid cards that Syrus can drop, it doesn't change the fact that the Roids just aren't a good archetype
There are nearly 100 cards with the rat creature type, and they all have black in their color identity
A 2/2 flying haste for three isnt much to write home about in Commander, whether its a creature or an Aura, but when you combine these two things and give it the ability to recur itself through collecting evidence, you have my attention
I also spent a bit of time debating how to utilize one or two pockets of negative space on the design depending on the card type, namely where the Monsters' levels/ranks go compared to my first design
These arent the most efficient mana rocks in the world, but in conjunction with Coretapper, you can add charge counters to them on a whim and get access to a lot more mana