At the beginning of your upkeep, if five or more instant and/or sorcery cards are in your graveyard, return target instant or sorcery card at random from your graveyard to your hand.
2018-09-03
Magus of Memories's ability checks if there are five or more instant or sorcery cards in your graveyard when it triggers and when it resolves. If you control multiple Magus of Memories, you will only return cards as long as there is still at least five instant or sorcery cards.