This healing effect makes Venusaur EX incredibly resilient, forcing opponents to work hard to knock it out
A solid example would be a Radiant Greninja [Astral Radiance] in a Gardevoir ex [Scarlet and Violet] deck because they dont play any Water Energy, very rarely play Professor Turos Scenario, and dont play any switching outs
Snorlax, in particular, was used as a giant wall, but due to needing four energy to attack, it could only stall and never pose a real threat
Whether playing with a friend or competing in an official Play
The unspoken assumption being that those same players will be able to purchase more within the app, probably via microtransaction using real money or some fun premium currency that totally isnt obfuscating the blatant monetisation scheme
You're hoping to beat the average by pulling one of the high-value SIRs or, dream scenario, the Hyper Rare Pikachu