Whenever this creature blocks or becomes blocked, target opponent gains control of it. (This removes this creature from combat.)

Flying
Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.

(: Add .)

At the beginning of combat on your turn, you may cast an instant or sorcery spell with mana value X or less from your hand without paying its mana cost, where X is twice the number of legendary Wizards you control.

When this creature enters, you may search your library for an Aura card, reveal it, put it into your hand, then shuffle.

Whenever you attack with two or more creatures, draw a card.

: Add , , or .
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When this creature is turned face up, add .

Whenever you sacrifice a creature, draw a card. This ability triggers only once each turn.
, , Sacrifice another creature: You gain X life and put X +1/+1 counters on target creature you control, where X is the sacrificed creature's power.

Jump — During your turn, Kain has flying.
Whenever Kain deals combat damage to a player, that player gains control of Kain. If they do, you draw that many cards, create that many tapped Treasure tokens, then lose that much life.

: Exile target card from a graveyard. If it was a permanent card, put a +1/+1 counter on this permanent.
Equipped creature gets +1/+1 for each +1/+1 counter on this Equipment.
Reconfigure (: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

During your turn, creatures and planeswalkers you control have lifelink.
+2: Sorin deals 1 damage to target player or planeswalker.
−X: Return target creature card with mana value X from your graveyard to the battlefield. That creature is a Vampire in addition to its other types.

Menace
Creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)
Whenever a creature an opponent controls dies, if its toughness was less than 1, draw a card.

Deathtouch
Each other creature you control with a +1/+1 counter on it has deathtouch.

This spell costs less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Tap up to one target creature. It doesn't untap during its controller's untap step for as long as this Saga remains on the battlefield.
II — Draw two cards.
III — You may put an artifact card with mana value 5 or less from your hand onto the battlefield.

Choose one —
• Break Their Chains — Destroy target artifact.
• Interrogate Them — Exile the top three cards of target opponent's library. Choose one of them. Until the end of your next turn, you may play that card, and you may spend mana as though it were mana of any color to cast it.

Flying
Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.
: Draw a card.

This land enters tapped unless you control two or fewer other lands.
: Add or .

Haste
Whenever this creature attacks, defending player reveals the top card of their library. If it's a land card, that player puts it into their hand.

This land enters tapped.
: Add , , or .
, Return a tapped creature you control to its owner's hand: Put this card from your hand onto the battlefield. Activate only as a sorcery.