Those Who Came Before — This spell costs less to cast for each historic card in your graveyard. (Artifacts, legendaries, and Sagas are historic.)
Exile any number of historic cards from your graveyard with total mana value 30 or greater: You get an emblem with "Creatures you control have base power and toughness 9/9."

At the beginning of your upkeep, this artifact deals 2 damage to you.
Sacrifice a creature: Target opponent gains control of this artifact.

Changeling (This card is every creature type.)
As this creature enters, choose a creature type.
Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature.

You may have this creature enter as a copy of any creature on the battlefield.

When this land enters, choose a land card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
Lands with the chosen name have ": Add ."
: Add .

As long as you've discarded a card this turn, you may pay to cast this spell.
When Asmoranomardicadaistinaculdacar enters, you may search your library for a card named The Underworld Cookbook, reveal it, put it into your hand, then shuffle.
Sacrifice two Foods: Target creature deals 6 damage to itself.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
At the beginning of combat on your turn, create a 1/1 red Goblin creature token. That token gains haste until end of turn and attacks this combat if able.

: Add .

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and no matter when it came under your control.)
Equip (: Attach to target creature you control. Equip only as a sorcery.)

As this enchantment enters, discard your hand.
At the beginning of your draw step, draw an additional card.

This spell can't be countered.
Reach, vigilance, deathtouch, hexproof, haste

Whenever one or more creature cards leave your graveyard, create a 1/1 black Bat creature token with flying.

Until end of turn, creatures you control gain trample and get +X/+X, where X is the greatest power among creatures you control.

Flying
Discard a card: Add .

Double strike
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When this creature enters, for each opponent, put up to one target nonland permanent that player controls into its owner's library third from the top.

Flying
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
At the beginning of combat on your turn, choose up to one target creature you control. Until end of turn, that creature gets +2/+0, gains trample if it's red, and gains vigilance if it's white.

This artifact enters tapped.
: Add .

When this enchantment enters, draw two cards.
At the beginning of each other player's draw step, that player draws an additional card.
At the beginning of your draw step, draw two additional cards.

(: Add .)

Firebending 2 (Whenever this creature attacks, add . This mana lasts until end of combat.)
When Azula enters, target opponent exiles a nontoken creature they control, then they exile a nonland card from their graveyard.
During your turn, you may cast cards exiled with Azula and you may cast them as though they had flash. Mana of any type can be spent to cast those spells.