There are, what, 3 versions of Vraska that create "You lose the game" effects
The mana cost and sorcery speed is steep, but it's a decent way to look through hopefully five or more cards and keep the three you can use
"Replicate [cost]" means "As an additional cost to cast this spell, you may pay [cost] any number of times" and "When you cast this spell, if a replicate cost was paid for it, copy it for each time its replicate cost was paid
No gross drippy cheese, just the Avengers campus cookout
Then it protects itself with its minus ability, bouncing a creature back to its owners hand
As such, it lends itself very well to deck upgrades, but even if you forgo upgrading it, Limit Break is still a great deck to play with out of the box without any alterations