Whenever you cast a historic spell, create a 1/1 white Soldier creature token. (Artifacts, legendaries, and Sagas are historic.)
Whenever Alistair attacks, you may pay . If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Woman Who Walked the Earth — When Martha Jones enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, Martha Jones and up to one other target creature can't be blocked this turn.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Choose two —
• Put two +1/+1 counters on up to one creature. It gains lifelink until end of turn.
• Destroy each creature with power 2 or less.
• Return up to two creature cards from your graveyard to your hand.
• Each opponent sacrifices a creature with the greatest power among creatures they control.

Deathtouch
Darkness — Whenever Cecil deals damage, you lose that much life. Then if your life total is less than or equal to half your starting life total, untap Cecil and transform it.

Creature spells you cast from your hand have blitz . (If you cast a spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)
Whenever chaos ensues, return target creature card from your graveyard to your hand.

Whenever this creature attacks, put a +1/+1 counter on target creature of defending player's choice.

Return How to Keep an Izzet Mage Busy to its owner's hand.

Vigilance
When Alquist Proft enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
, , Sacrifice a Clue: You draw X cards and gain X life.

: This creature becomes a Kithkin Spirit with base power and toughness 2/2.
: If this creature is a Spirit, it becomes a Kithkin Spirit Warrior with base power and toughness 4/4.
: If this creature is a Warrior, it becomes a Kithkin Spirit Warrior Avatar with base power and toughness 8/8, flying, and first strike.

(: Add .)

If an opponent controls seven or more lands, this spell costs less to cast.
Flying
: This creature gets +1/+0 until end of turn.

Flash
Flying
Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, counter target spell, activated ability, or triggered ability.

Destroy target creature with horsemanship.

When this creature dies, you may exile it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and put all other cards revealed this way into your graveyard.

Destroy all artifacts and enchantments. You gain 2 life for each permanent destroyed this way.

Choose up to five worth of modes. You may choose the same mode more than once.
— Each player sacrifices a creature of their choice.
— Draw a card for each creature that died under your control this turn.
— Each opponent loses X life, where X is the number of creature cards in your graveyard.

At the beginning of your end step, if you gained life this turn, each opponent loses 1 life.
At the beginning of your end step, if you gained and lost life this turn, create a 1/1 black Bat creature token with flying.
, Pay 2 life: Draw a card.

: Add .
, , Sacrifice a Desert: Exile all graveyards.

, : Create a token that's a copy of target creature card in your graveyard, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step.