Lorwyn–Shadowmoor block

Whilst not a block in and of itself, Lorwyn–Shadowmoor block is a combination of the Lorwyn and Shadowmoor (mini-)blocks. The block was released over 2007–2008.

Connection
Although these mini-blocks are distinct in terms of game mechanics, they are linked in their flavor (being set on alternate versions of the same plane) and are treated as a single block for the purpose of rotation. With the release of Shadowmoor, Lorwyn–Shadowmoor block also replaced Lorwyn block for the Block Constructed format.

Flavor
For inspiration, the creative team turned to Celtic folklore and mythology. There are influences from Irish, English, Welsh, Scottish, and Celtic stories, languages and cultures in both the look and world details of the setting. Mark Rosewater later stated that the flavor erred in being too true to the source material rather than hitting the tropes players knew. The latter would be revisited in Throne of Eldraine.

Lorwyn block
The Lorwyn block is the thirteenth block; unlike all previous blocks, it consist of only two sets: the large expansion, Lorwyn and the small expansion, Morningtide. The block came out in 2007–2008.

Keywords introduced in this block: Champion, Changeling, Clash, Evoke, Hideaway, Kinship, Prowl, and Reinforce.

Planeswalker, a new card type, debuted in this block. Tribal, another new card type, debuted in the previous block but was fleshed out in Lorwyn.

The race/class system is a major theme of this block. Each creature in the block belonged to one of the following nine creature types: Elemental, Elf, Faerie, Giant, Goblin, Kithkin, Merfolk, Shapeshifter, and Treefolk.

Mega cycles
Three mega cycles exist across the block's two sets:
 * Mono-colored legends: Each of these rare legendary creatures represents one of the main protagonists of the Lorwyn and Morningtide novels Brigid, Hero of Kinsbaile, Vendilion Clique, Maralen of the Mornsong, Ashling the Pilgrim, Rhys the Exiled.
 * Rare changelings: Each of these rare shapeshifter creatures has changeling and another powerful ability Mirror Entity, Shapesharer, Cairn Wanderer, Taurean Mauler</c>, Chameleon Colossus</c>.
 * Tribal lands: Each of these rare lands comes into play tapped unless you reveal a card in your hand of a certain creature type; there was one for each of the block's eight tribes.
 * The tribal lands from Lorwyn could each be tapped for either of its tribe's colors Ancient Amphitheater</c> (giants, red and white), Auntie's Hovel</c> (goblins, red and black), Gilt-Leaf Palace</c> (elves, green and black), Secluded Glen</c> (faeries, blue and black), and Wanderwine Hub</c> (merfolk, blue and white).
 * The tribal lands from Morningtide had different abilities from the lands in the previous set but shared their "tribal untap" ability Murmuring Bosk</c> (treefolk, counts as a Forest, can also be tapped for white or black mana at the cost of 1 damage), Primal Beyond</c> (elementals, can be tapped for any color of mana but only to pay for elemental spells), and Rustic Clachan</c> (kithkin, can be tapped only for white mana but has reinforce).
 * Two cards, the common Shimmering Grotto</c> and rare Mutavault</c>, were associated with the changeling "tribe," but were not part of the cycle.

Shadowmoor block
The Shadowmoor block is the fourteenth block; as a mini-block it consist of only two sets: one large expansion, Shadowmoor, and one small expansion, Eventide. The block came out during the first half of 2008.

Ability word introduced: Chroma

Keywords introduced in this block: Conspire, Persist, Retrace, Wither.

Mechanics introduced in this block: The untap symbol.

A major theme of the Shadowmoor block was color. Hybrid mana, introduced in the Ravnica block, was brought back in Shadowmoor and given a more thorough treatment. -1/-1 counters were among the block's minor themes.

Mega cycles
Seven mega cycles exist between the two sets, each made up of ten cards, one for each color pair.

Mirrored Pairs
Shadowmoor block has one mirrored pair.