Vilis, Broker of Blood allows you to spend one black mana and 2 life to draw a card by targeting itself, which you can repeat eight times until Vilis poetically succumbs to their own ambition
It has a flashback cost, but this one requires you to discard cards from your hand instead of paying the X mana
Cost reduction for activated abilities makes this great for a combo-esque deck using Training Grounds effects to enable a busted combo with cards like Kenrith, the Returned King
Weve also got Whirler VirtuosoWhirler Virtuoso, Aetherstorm RocAetherstorm Roc, Lightning RunnerLightning Runner, Aethersquall AncientAethersquall Ancient, Glimmer of GeniusGlimmer of Genius, Confiscation CoupConfiscation Coup, and more
(1) If this card is Xyz Summoned: You can target 1 Level 4 or lower Dragon Ruler in your GY or banishment