resolve one cascade trigger and the spell you cast from it before resolving the next cascade trigger.
When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with This creature gets +1/+1 for each artifact you control. You can also tap an untapped Artifact you control to add one Blue mana, and you can pay five to shuffle your library and then exile the top card of your library, then you can cast it for free until the end of the turn
When you have black hand disruption is usually a more reliable, rapid and well rounded problem solving solution
On turn three, playing Screaming Nemesis, Broadside Bombardiers, or True-Name Nemesis can cement your advantage
With 21 other legendary spells, and Zack being replayed frequently, shell draw you cards all the time