Jodah's Codex⁣ - Dominaria United⁣ (Uncommon)⁣ [233]

Jodah's Codex is a five-mana artifact that allows you to draw a card by paying five mana and tapping it, but the cost decreases by one mana for each basic land type you have among the lands you control. This means that if you have a diverse mana base, particularly with all five basic land types, you can activate its ability for just one mana, making it a powerful card draw engine. However, if your deck lacks colour variety, it can become expensive to use, which might limit its effectiveness in less diverse builds.