In the Jace example, if there were two cards in your original graveyard and three cards in your newly-appropriated graveyard, that would satisfy Jace's requirement
It comes in four main flavors: Mana rocks artifacts that tap for mana (Sol Ring, Signets, Talismans)
Demonic Counsel Demonic Counsel is Demonic Tutor if you have delirium enabled, or a good creature tutor in a demon deck, or a Kaalia of the Vast EDH deck
Zenos yae Galvus Zenos is a very odd card, providing a miniboard wipe on the face, and an interesting challenge for Johnny (combo type) players to solve, and unlock Shinryu, Transcendent Rival
June 24-July 2 Were celebrating MTGOs 23 rd Birthday with a twist on Battle of the Planes that well reveal later this month
In came Madam Mim, Rival of Merlin, who could be exerted to play a character with a cost of four or less for free from your hand