The second addition that was suggested was actually a second win condition
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)
When we talk about the importance of evasion, not only is that important for the sake of being evasive, but also for the sake of stopping evasive maneuvers
There are even promo versions of cards
Another slight issue with Tracker is that if you make him on turn two or three having already made your land that turn you risk trading it for a Shock or some such without getting any (clues) value at all