If you need a sample, look up Mystic Forge and Foundry Inspector
If you are defined as the protector of a battle, you can use your own creatures to block any creatures attacking the battle
While the green one is far and away the most versatile and easy to find a use for, none of them are unplayable, and all can slot into your mana bases without much trouble, especially given they enter untapped
While at first glance, Black and White may appear to be two of the most polar opposite colors in all of Magic: The Gathering, when working in conjunction, the colors bring a lot of power to the table
Its immediate impact is inferior to "Phyrexian Portal," but I value the fact that it can deal with non-creature permanents
Having game pieces be unobtainable is bad, and if you cant afford to pick up a Wheel, dont feel bad about proxying one