The common thread between these two approaches is knowing what you enjoy, so giving that some thought should be your first step
1 Liliana, Waker of the Dead
Mana Ramp If your blue deck likes to ramp and ramp hard, Vanguard Suppressor can certainly take advantage of it
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Boomflinger Artifact Contraption Whenever you crank this Contraption, roll two six-sided dice
While each card has an icon in the top left corner to define if it's the front or the back (such as Innistrad-based sets using a Sun and a Moon, or Ixalan having a compass and a mountain), the front face is always the one with the mana cost
That goes double for a Niv-Mizzet, VisionaryNiv-Mizzet, Visionary deck, where the more efficient burn spell you could be playing instead for one mana will draw you more cards to get more burn spells and keep the whole cycle going