I put TCGPlayer gift cards on my Christmas list because I knew there would be some wildly expensive versions of characters that I needed to have
Ulamog, the Infinite Gyre
To get to a place in which you can play it, though, youll need cards like Prismite and Prophetic Prism, which allow you to pay mana in order to gain mana of any colour, and Skittering Surveyor, which lets you look through your deck for a land card of your choice and put it in your hand
You can very quickly build a massive army of zombies, which synergizes with The Scarab God's abilities to drain your opponents
Lastly, note that "mana cost" was originally called "casting cost" up until the release of the Sixth Edition core set, which brought a number of important rules and terminology changes