Underworld Breach Ok, so TECHNICALLY, Underworld Breach isnt card advantage

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Doctor Who s Auton SoldierAuton Soldier allows us to copy another one of our double-sided creatures and draw cards off the myriad copies
Cabal Coffers Flipped Itlimoc, Cradle of the Sun Nykthos, Shrine to Nyx Aside from accelerating you significantly, it can also untap lands that enter tapped, and provide you a second go on Maze of Ith and Spires of Orazca, among other effects
Possessing the ability "evolve," Gyre Sage is an elf that receives a +1/+1 counter each time a creature enters the battlefield under your control with either power or toughness greater than the Gyre Sage