Outside of a few very specific cards (which will be mentioned first) that require deck sizes above the minimum, all the other reasons you might want to are more fitting to casual magic: Battle of Wits - A win condition that specifically requires you to have more than 3 times the minimum deck size left in your deck to win means starting with about 4 times that minimum, if not more
Scarlet & Violet - Surging Sparks Unleash 10,000,000 Volts with the latest Pokmon TCG Set, Scarlet and Violet: Surging Sparks
3 Erikas Dragonair (Holofoil) $148.34 A Beloved Middle Evolution Erika's second appearance on this list is a surprise, as she teams up with her Dragonair to form one of the most expensive duos in the set
I got there with both mono blue (went From Diamond Tier 4 with 0/6 wins to Diamnond tier 1 with 5/6 wins to mythic) and mono black(went from Diamond Tier 3 with 0/6 wins to Diamond tier 1 with 4/6 wins to mythic)
These are by far the most powerful cards and lock your opponents out the hardest
Appropriate, given the name