Vampire Crawlers combos, explained
via polygon.com
Short excerpt below. Read at the original source.
The Vampire Crawlers: The Turbo Wildcard from Vampire Survivors‘ combo system is the most powerful feature in the game, yet it’s easily overlooked. If you play your cards in a certain order, you will stack a damage multiplier, which can make the same card merely “decent” or insanely powerful, solely depending on when it’s played.