Cycling [cost] means [Cost], Discard this card: Draw a card. 702.29b: Although the cycling ability can be activated only if the card is in a players hand, it continues to exist while the object is on the battlefield and in all other zones
reveal up to 1 [Sabo], [Portgas.D.Ace], or [Monkey.D.Luffy] with a cost of 5 or less and add it to your hand
It's often losing nothing for being super mana-efficient, and it means this card just becomes a second copy of any card in your deck with a mana value of 4 or less
Blue Memory Boost is such an amazing card and most of the time it is mandatory to play this in any blue deck to help see your pieces faster
Statistical Yearbook 2018 (PDF)
There are comboing Dragons, Vampires with incredible protection, and Merfolk that accrue so much card advantage that it can be staggering