At first, its just a land that taps for blue, but once you station enough charge counters onto it (12 or more), it transforms into a serious mana engine
You want to make people curious about history enough that theyre gonna go after and seek out the sources and see, Oh, well, this is so cool
Cards that use charge counters usually have some ability tied to those counters, so removing a counter may prevent a triggered ability from firing off, or make an activated ability less powerful
Additionally, while Chaos Warp would simply not take any additional action if the card isn't a permanent, Chaos Wrap gives the player an option to play it face-down as a 4/4 red creature with the Present type
Obviously, classic blue-white control players will put at least two copies of this card in their lists due to its very useful Lifelink and draw mechanics