Magic: The Gathering

Technicalities
Block: Lorwyn
Rares: 80
Uncommons: 80
Commons: 121
Land: 20

Features
Lorwyn has a new card type. Planeswalkers.
It's not a creature, it's another type of permanent. Planeswalkers have no power or thoughness, and they can't attack. However, when damage flows through to the player, a planeswalker can take the damage instead.
Counters on a planeswalker designate its loyalty. When there are no more counters, the planeswalker is put into a graveyard.
Each planeswalker has special abilities, they either cost loyalty, or loyalty is added when it's used.

The story
Elves live in a world of unforgiving perfection. It is survival of the fittest -- and none but the most beautiful and deadly are allowed to survive. So when an elf warrior's horns are shattered and his flawless features lost, he knows it is a death sentence. What he can't remember is how it happened or why he should allow himself to be killed. Powerful and ancient magic is at work, and the elf will need to find friends fast before his fellow elves quiet him -- permanently.

May I present to you,

Future Sight.

Technicalities
Block: Time Spiral
Rares: 60
Uncommons: 60
Commons: 60

The story
To the future and beyond,
The quest to mend Dominaria's temporal and planar damage continues. A temporal rift connected to an alternate Dominaria has enabled Phyrexian horrors to cross over into the present day. Freyalise is gone, having given her planeswalker spark and her life to close that rift, thereby protecting her sanctum of Skyshroud one last time.

But time fractures still plague Dominaria. The damage to the planar fabric at Tolaria was so severe that it couldn't be healed-not in the present day. The heroes seek out the planeswalker Karn, the only being ever to travel through time. To heal Tolaria's rift, Karn uses the full extent of his planeswalking power to enter the rift and return to the past, to the moment before the archwizard Barrin cast a spell that obliterated countless Phyrexians and himself. Karn succeeds and seals the planar rift before Barrin's actions can rip it open. In the next moment, Karn is lost.

Even as Venser begins to realize his full potential, the planeswalker Jeska returns to Dominaria for the first time since Karona fell. Her friend and ally Karn is gone, and someone will pay. An ancient, evil intelligence drives Jeska's wrath and threatens to undermine Teferi and Jhoira's efforts to complete Dominaria's healing: Leshrac has returned.

May I present to you,

Planar Chaos, when time just wasn't what it used to be.

Technicalities
Block: Time Spiral
Rares: 50
Uncommons: 55
Commons: 60

The story
Teferi Planeswalker sacrificed his powers to mend the splintering Multiverse, but it was too little and too late. An unnatural cold has taken root in Dominaria and is spreading. Now powerless, Teferi tries to find a way to finish what he started before the world is destroyed by the havoc he unintentionally wrought.
Get the book: Planar Chaos, Time Spiral Cycle, Book 2