Its mostly due to how you choose to sort your cards rather than the storage method, so Ill go into this a bit more later
When this Dinosaur enters the battlefield or attacks, you get to spit up a -1/-1 counter on a creature
In Standard, it is already great for Dimir Midrange, allowing you to hold up disruption like Tishanas Tidebinder while building an aerial army
Destroy it, and if you do, draw 1 card, then if you control a "Destiny HERO" monster, you can Special Summon 1 "Destiny HERO" monster from your hand, GY or banishment
If you don't control an Army, the Sliver Army token you create enters the battlefield as a 0/0 creature before receiving counters
While understanding and modeling of the epidemic and evolution of the disease is timely and very interesting (and I have thrown my share of amateurish attempts at the problem), its not the purpose of this blog to discuss such things