To that end, Mark rather famously changed the functionality of Time Vault right out from under the then-popular Time Vault-Flame Fusillade combo, as detailed in this Ask Wizards
All in all, while the non-budget build is technically an upgrade, apart from the sideboard improvements, I'm not sure the upgrades are meaningful enough to run out and spend $260 on a playset of Cavern of Souls
Dont be afraid to cast Mizzix's Mastery for 4 when needed
The product description also states that some set boosters may contain special cards, such as traditional sheet country cards or stamped signature art cards, which can be used according to the rules of the game
There may be a price involved with tutoring up cards, which could come in the form of paying life or sacrificing creatures
Illustrated by Dan Seagrave Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp