Wheel cards often make you discard your own cards as well, so when paired with cards with madness, this can lead to easy casting of your spells thanks to the alternate costs
Here is a deck on Sunburst, and here is one on Affinity, and here is one on another of the latest mechanics
Casting any spell, regardless of whether or not youre augmenting the casting cost with delve or not, forces you to lose life equal to that spells mana value
One could say it is almost essential for achieving the subquest above
Many players get very lax about keeping up with Smothering Tithe triggers, but with card draw added in they'll be much more likely to pay their taxes
The 3/3 Elephant token it creates can't block our creatures, so it's almost like a Vindicate in this deck