All of these, as well as similar instants, take Kalamax infinite (or to some arbitrarily high level of power and toughness) by having Kalamaxs copy of your Fork effect copy the original, then having that new copy do the same, then repeating ad nauseum
In Magic: The Gathering, an early-round mana boost can be game-changing, and Mana Vault is one of the most cost-effective ways to achieve this, especially if it's played alongside cards with an untap effect
We've all been there
This could also see play in +1/+1 themed Commander decks
This set brings all sorts of famous and retro land cards back into the TCG, and sure enough, it's a very old, very valuable land that I'm talking about today: Ancient Tomb
Im giving it a whirl simply due to the fact that it replaces itself