At the time of writing, Skymarch Bloodletter and Lichs Caress are two solid commons that have incidental lifegain (among many other cards that gain life)
TCGPlayer works best for cards competitive players actively hunt, especially anything tied to the current meta
A few years back when HASCON took place, Wizards took the opportunity to design silver bordered Magic cards based on some of Hasbro's other properties (namely Dungeons & Dragons , Transformers , and NERF )
Don't go bringing these cards to a Standard game because, while your deck will undoubtedly be the best at the table, it'll also be illegal
If someone tries to board wipe or remove your key creature, these cards can make your entire team indestructible
The effect stopping its activated abilities will still apply