Budoka Pupil is pretty dull on this scale
Dark Ritual effects one-shot bursts like Dark Ritual, Cabal Ritual, and Songs of the Damned for explosive early plays Swamp-scaling engines Cabal Coffers, Crypt Ghast, and Nirkana Revenant multiply mana based on your Swamp count Life-to-mana conversion K'rrik, Son of Yawgmoth and Bolas's Citadel let you spend life instead of mana Sacrifice-based mana Phyrexian Altar and Ashnod's Altar convert creatures into mana for combo turns Treasure generation Revel in Riches, Black Market Connections, and Pitiless Plunderer produce Treasures tied to death triggers Building a Black Ramp Package Mono-black ramp packages should be built around the Coffers engine: Cabal Coffers, Urborg, and 2-3 Swamp-scaling payoffs like Crypt Ghast and Magus of the Coffers
We'll stick with cards you can play, feasibly, in your Constructed deck
She's the best option if you want a grindier, more recursive approach
While there are plenty of normal cats in Magic, there are also quite a few cat hybrids like cat dragons or elemental cats
Liliana's Caress has an almost identical effect for two mana, but since that one is life loss, it won't count for certain other effects
