There are around seven cards in the English language print that have errata on the app
This is a very flexible ability, but it works particularly well with a board full of Saprolings, doubling it into a massive horde which, if left unchecked, will continue to double turn on turn, until it consumes the entire pod
While it shines in formats with fetch lands, its generally powerful everywhere
The recursive nature of Recurring Nightmare is particularly rewarding with creatures that create tokens upon entering or leaving the battlefield, like Wurmcoil Engine, Grave Titan and Thragtusk
I love that Clown Car lets you roll multiple dice at once and scales as the game goes on, hopefully netting you some 1/1 token creatures and a Vehicle of medium size
Considering there are 6591 serialized Doctor Who cards in existence, however, this shouldnt really be such a surprise