Rielle, the Everwise The first place your mind goes upon reading Rielle, the Everwise is Wheel of Fortune and drawing fourteen cards, but theres plenty of utility beyond that
Disa can also go wide by creating a plethora of Tarmogoyf creature tokens depending on if the controller can consistently deal combat damage each turn
But that's okay, because getting just the first trigger is pretty good
And whenever they gain life, you gain that much life, too
(12/8/2022) If you discard a card with madness to pay the cost of a spell or activated ability, that card's madness triggered ability (and the spell that card becomes, if you choose to cast it) will resolve before the spell or ability the discard paid for
Another variation on the above line is that in lieu of a Devolution Spray, you can use AZ + VS Seeker