I attempted to answer this question through an analysis of 30 different sets in MTGs history
Simplicity is divine, and the card draw Reki provides is the sweetest form of divinity

Number of cards: 103 Release date: February 8, 2012 Abbreviation: NXD B & W: Dark Explorers : Hexagon with a half-circle carved from the top Number of cards: 111 Release date: May 9, 2012 Abbreviation: DEX B & W: Dragons Exalted : Spiral symbol Number of cards: 128 Release date: August 15, 2012 Abbreviation: DRX Dragon Vault : Dragon body symbol Number of cards: 21 Release date: October 5, 2012 Abbreviation: DRV B & W: Boundaries Crossed : 6-pointed star overlapping half of a hexagon Number of cards: 153 Release date: November 7, 2012 Abbreviation: BCR B & W: Plasma Storm : Black shield-symbol with white rays in the center Number of cards: 138 Release date: February 6, 2013 Abbreviation: PLS B & W: Plasma Freeze : Black hexagon with 3 pieces taken out on the left side Number of cards: 122 Release date: May 8, 2013 Abbreviation: PLF B & W: Plasma Blast : Black shield-symbol with 3 curves along the top and sides Number of cards: 105 Release date: August 14, 2013 Abbreviation: PLB B & W: Legendary Treasures : Open hexagon with spikes on the right side Number of cards: 140 Release date: November 6, 2013 Abbreviation: LTR Advertisement The XY series includes Pokmon from Gen VI following the release of the X and Y games

Realm-Cloaked Giant I keep coming back to this card over and over, and I keep having the same feeling: this card may end up being a mistake (nah, probably not)
Sacrifice after IV.) I Create two 1/2 white Moogle creature tokens with lifelink