Reality Fracture

Jace

Sorcery

Exile all creatures. Empower Jace X, where X is the number of creatures exiled this way. (Put that many loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")

Overwrite the Multiverse

The Lost Caverns of Ixalan

Land

As this land enters, choose a creature type.
{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Cavern of Souls

The Lord of the Rings: Tales of Middle-earth

Enchantment

Ward {3}
Whenever you cast your second spell each turn, copy it, except the copy isn't legendary. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Storm of Saruman

Tentacle

The Watcher in the Water

Legendary Creature — Kraken

The Watcher in the Water enters tapped with nine stun counters on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Whenever you draw a card during an opponent's turn, create a 1/1 blue Tentacle creature token.
Whenever a Tentacle you control dies, untap up to one target Kraken and put a stun counter on up to one target nonland permanent.

Aragorn, the Uniter

Human Soldier

Legendary Creature — Human Noble

Whenever you cast a white spell, create a 1/1 white Human Soldier creature token.
Whenever you cast a blue spell, scry 2.
Whenever you cast a red spell, Aragorn deals 3 damage to target opponent.
Whenever you cast a green spell, target creature gets +4/+4 until end of turn.

Secret Lair Countdown

Target opponent loses life equal to the number of creatures they control. Then destroy all creatures.

Villainous Wrath

Secret Lair Drop

({U/P} can be paid with either {U} or 2 life.)
Look at target player's hand.
Draw a card.

Gitaxian Probe

Artifact

Whenever an opponent draws a card, you may pay {1}. If you do, draw a card.