With both of those Pokemon needing three or even four Energy to perform their Moves, having a way to get that much Energy onto them is crucial
Teferi, Time Raveler Teferi, Time Raveler holds the impressive distinction of being among the most obnoxious planeswalkers ever printed, largely due to that static ability that doesnt just kill countermagic but shuts off a variety of strategies
Instead, it shuffles them back into the deck, so there is little risk of losing your other resources while trying to get more Energy on the field
For Pre-Orders - Sometimes due to long time between making/paying the Pre-order and the actual release of the item takes several months, therefor it is possible additional fees to be collected upon shipping the order.
It slots effortlessly into Jund decks, which were often already going for an overkill scenario anyways