What is the card type Phenomenon and Ongoing?
Both are used in Magic variant formats; that is, not the "usual" rules of the game.


Phenomenon is a card type used in the Planechase format. Cards of this type are oversized, and put in a separate planar deck, along with Plane cards, not the deck that becomes the player's library.
Ongoing is a supertype that only applies to the Scheme card type, which is used in the Archenemy variant. Cards of this type are also oversized, and put in a separate scheme deck.