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While the deckbuilding restriction wont let you put every multicolored card you might want into your deck, Magics card pool is large enough to make it trivial

This means that a Karn deck doesn't need to concern itself with including many creatures to attack or block with, as it can be used to turn anything from an Unwinding Clock to a Darksteel Forge into an offensive or defensive body on the board

And these were some truly beautiful reveals

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)