having too many relics is not a problem, unless it is (1) forcing you to sleep too much (can't upgrade valuable cards) or (2) killing you due to low HP.
having too few relics is a problem I frequently have.
something I don't do enough is actually figure out why I died. Was I too aggressive in improving my deck? Too passive? Should I have picked a different relic, or a different card?
@AdmBorkBork That's definitely a tactical mistake. Especially when you still have un-upgraded debuff cards like Go for the Eyes and Neutralize. Weakness and Frailty going from 1 -> 2 is a huge change
Sometimes Face-tanking and rushdown is the answer to certain mooks, but having a fight go longer to mitigate damage will go a long way to letting you upgrade
@NathanMerrill Too many boss relics can also definitely put you in a rough spot if you don't think it through.
@AdmBorkBork One more note on upgrading, most cards go from okay to good, or good to better, but a handful go from good to Fantastic when upgraded. Like your debuffs going from 1>2, Cost reductions, losing exhaustion, etc.