As this is a printing error found in nearly every set
In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck
Both these cards are in Portuguese so if you're having trouble making out the text, that's why
Here are some of those cards, cards you would otherwise see on a best of list
Blood Sun is awesome because many decks won't be bothered much (my Ghalta Commander deck from yesterday only had two lands that had abilities this would shut down)
When the equipped Creature deals combat damage to a player, the triggered ability gives two effects that are representative of the color identity of the colors it has protection from