Penny Dreadful is an unofficial competitive Constructed format for MTGO consisting of cards which cost no more than 0.01 tix.
Updated list of allowed cards is published every Standard set, and remains valid until next Standard set release.
You can learn more about the format by visiting its official website.
To check most recent list of available cards, search f:"penny dreadful"
There are no banned cards.
There are no restricted cards.