By the same token where Damn is now allowed in your mono-blue deck, you cannot add cards like Mystical Teachings or Rona's Vortex
Unlike traditional card draw, you arent accumulating lands at a faster pace as well when learning, so the typical churn where drawing more cards gives you more spells and the resources to cast them is absent
Your other creatures will usually act as a defensive wall and resource engine, tapping down immediately before your turn to draw free cards (or later on, to grow their stats)
It also allows for some nice silver bullets
Today we get all over Ulalek, Fused Atrocity as an Eldrazi commander, see what makes it tick, and go over options to build it in a fairly different way from its EDH precon deck
Once the trigger occurs, the loop resolves fully before the opponent can respond, instantly draining them to 0