Wizards seems not to want to include these in Secret Lairs, and they may want to keep them to hype up booster boxes to sell packs
Time Vault has a complicated history, having gone through several erattas and updates to the text to get it to work the way it was intended
Marcus 'Notch' Pearson (Minecraft, Scrolls) Ignoring how annoying the obvious Minecraft reference is, this is a pretty Spike-y card that is build for aggro Red
2020-11-10 You must pay the costs to cast a spell this way
When Cavalier of Flame dies, it deals X damage to each opponent and each planeswalker they control, where X is the number of land cards in your graveyard
It provides the ability to grind out when you run out of cards, almost giving you an extra card draw each turn, but better, as it's a permanent of your choice from your graveyard, nulling any efforts by your opponent when using removal spells