Generally speaking, its better to have money invested than it is to have money sitting in a bank account (or in a plastic bag from a Chinese delivery place tucked under your mattress)
This includes monthly challenges, quarterly cups, and prerelease tournaments with every Pokemon TCG expansion
Goldins auction will likely have more luck, as the trading card fervour whipped up in 2020 by a combination of free time, pandemic depression and (sigh) Logan Paul shows little abatement
You must cast the first portion of an aftermath card from your hand
The one rule of lifegain: sources feed payoffs A lifegain deck has two halves, and it is dead without both: Sources cards that gain you life, ideally incrementally and repeatedly (lifelink, whenever a creature enters triggers, upkeep gainers)