You also have a smattering of ways to turn life gain into big damage, albeit through creature combat
First, you want some cheap evasive infect and toxic creatures to get the poison ball rolling, like Blighted AgentBlighted Agent, Viral DrakeViral Drake, and Tainted ObserverTainted Observer
Thankfully, the person who found the card is aware of its worth and immediately submitted the card for authentication with PSA, a card grading firm
Ragost Lobsterfolk, he/him Being the most infamous ship's chef in Sothera, Ragost claims to have served on almost every freelancer vessel in the system, been engaged to a Eumidian princess, fought his way through a half-dozen KMN cruisers with nothing but a frying pan, turned down a Sunstar field commission, communed with the star god in Uthros's core, and been expelled from the Monoists' refectory on Susur Secundi
For just three mana it draws two cards, counters any spell or lets you gain control of target nonland permanent with mana cost one or less
Zombies tend to outnumber other non-typal decks, which makes Ravenous Rotbelly effective at narrowing the board in certain matchups