mtg first multicolored card MTGNexus Apocalypse (2001) gave us Cromat

Yes, Scroll Rack is a key card in 2 combo(s) in our combo database, linked from the Combos section of this page

This can vary between colorless cards, to planeswalkers to eldrazi ETB triggers

I tried telling it to give me a set of mechanics whose power levels add up to 10, and its unable to do that task

How about spending it to activate your other Elite Arcanist imprinting Cackling Counterpart to make infinite Elvish Archdruids and massive Elves

I dont know how much longer well keep that price point as the base setting, as I fully expect Wizards to crank that to $40/$50 as the base price at some point in the future

I personally would have liked to see Violent Outburst on this spot, as I think it is the better Cascade -enabler