You must continue onwards until you feel your vision vibrating and your grip on reality slipping
Lastly, if you have 4 mana lying around to cast Carnival of Souls and Chatterstorm, you can probably be doing better things
If your opponent routinely does damage in increments of more than ten or doesnt really care about your life total, youre a lot more likely to have problems, particularly if theyre very proactive
Non-archetype Link-1s like Linkuriboh offer creative solutions
QCSE Quarter Century Secret Rare Mementotlan Angwitch X DARK Level 3 [ SpellcasterEffect ] ATK 800 DEF 1000 If this card is Normal or Special Summoned: You can add 1 "Memento" monster from your Deck to your hand, except "Mementotlan Angwitch"
A few rental decks, however, do require multiple cards before they're unlocked such as the Kanto Fossils Deck