Sets like Zendikar and Khans of Tarkir include fetch lands, while Ravnica blocks are essential for shock lands
Set off on a big adventure in a brand-new expression of Magic filled with tinybut mighty!woodland creatures who wield the powers of their fantastical woodland world
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
9 Hans, Thirteenth in Line Small but mighty, this card can be what is exactly needed to shake things up
Just making tokens such as creatures or Treasure or Food tokens will trigger that ability, so each opponent will lose a lot of life over the course of several turns