A land card that can serve as a significant card draw engine, particularly in black midrange decks
Over time, this effect could become rather problematic if youre unable to gain life to compensate
Sigarda is a rock, lots of stats, lots of control over the board and a whole pile of reliability
The Specific Cards Are Not Format Appropriate Sometimes certain cards eventually become inappropriate for the format over time even if you have built the deck correctly in the past
Relic of Progenitus Just like Phyrexian Furnace, though Im not sure how many of this effect a single deck wants
It might not seem like a lot since three mana isnt a huge commitment, but it can mean the difference between playing just one creature face-down and passing, and playing a creature face-down and then being able to flip it back over before your next turn