Here are the cards I removed to make these changes: You can find the decklist with these changes here
They'd get a creature on the spot, and the threat to make more, forcing their opponent to come up with two answers rather than one
While that extra blue mana prohibits all decks from playing the Vault, some Trix decks found room for this powerful searcher back in the day
Zaffai, Thunder Conductor, Veyran, Voice of Duality and Melek Izzet Paragon, are classic spellslingers that would benefit from this card
Don't worry about sacrificing or discarding your lands , as you can get them back with ease thanks to The Necrobloom
The description on TCGplayers site is especially wide: The last sentence before the parenthetical note is especially vague