Whenever another permanent enters the battlefield under your control, each opponent mills a card.

Nonbasic lands are Mountains.

Draw three cards, then put two cards from your hand on top of your library in any order.

{T}: Target player mills a card. (They put the top card of their library into their graveyard.)

{5}, {T}, Sacrifice Codex Shredder: Return target card from your graveyard to your hand.

Counter target spell.

+1: Target player draws two cards, then discards two cards.

-2: Gain control of target artifact.

-6: You get an emblem with "Whenever you cast a spell that targets one or more permanents, gain control of those permanents."

You may return an Island you control to its owner's hand rather than pay this spell's mana cost.

Counter target spell unless its controller pays {1}.

Whenever Dragonspark Reactor or another artifact enters the battlefield under your control, put a charge counter on Dragonspark Reactor.

{4}, Sacrifice Dragonspark Reactor: It deals damage equal to the number of charge counters on it to target player and that much damage to up to one target creature.

This spell costs {1} less to cast for each artifact you control.

When Emry, Lurker of the Loch enters the battlefield, mill four cards.

{T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

Creatures with power greater than the number of cards in your hand can't attack.

{T}: Each player mills a card.

{T}: Choose target artifact a player controls and target artifact card in that player's graveyard. If both targets are still legal as this ability resolves, that player simultaneously sacrifices the artifact and returns the artifact card to the battlefield.

Players play with the top card of their libraries revealed.

{T}, Sacrifice Lantern of Insight: Target player shuffles.

Lightning Bolt deals 3 damage to any target.

{T}: Target permanent becomes an artifact in addition to its other types until end of turn.

{T}: Add {C}.

{T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.

{T}, Tap an untapped artifact or creature you control: Add {C}.

Channel -- {4}{U}, Discard Moonsnare Prototype: The owner of target nonland permanent puts it on the top or bottom of their library.

Metalcraft -- {T}: Add one mana of any color. Activate only if you control three or more artifacts.

As Pithing Needle enters the battlefield, choose a card name.

Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Pyroclasm deals 2 damage to each creature.

{T}: Each player exiles the top card of their library face down.

{7}, {T}, Sacrifice Pyxis of Pandemonium: Each player turns face up all cards they own exiled with Pyxis of Pandemonium, then puts all permanent cards among them onto the battlefield.

Whenever an artifact enters the battlefield under your control, Reckless Fireweaver deals 1 damage to each opponent.

Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on each artifact that became a creature this way.

Overload {4}{U}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

+1: Scry 1. Saheeli Rai deals 1 damage to each opponent.

-2: Create a token that's a copy of target artifact or creature you control, except it's an artifact in addition to its other types. That token gains haste. Exile it at the beginning of the next end step.

-7: Search your library for up to three artifact cards with different names, put them onto the battlefield, then shuffle.

Whenever Scrap Trawler or another artifact you control is put into a graveyard from the battlefield, return to your hand target artifact card in your graveyard with lesser mana value.

Destroy target artifact.

Dredge 1 (If you would draw a card, you may mill a card instead. If you do, return this card from your graveyard to your hand.)

Counter target spell with mana value 2.

{U/P}: Change a target of target spell or ability to Spellskite. ({U/P} can be paid with either {U} or 2 life.)

Kicker {X}. X can't be 0. (You may pay an additional {X} as you cast this spell.)

Flying

When Thieving Skydiver enters the battlefield, if it was kicked, gain control of target artifact with mana value X or less. If that artifact is an Equipment, attach it to Thieving Skydiver.

As an additional cost to cast this spell, sacrifice an artifact.

Search your library for an artifact card, put that card onto the battlefield, then shuffle.

Sacrifice an artifact. If you do, search your library for an artifact card. If that card's mana value is less than or equal to the sacrificed artifact's mana value, put it onto the battlefield. If it's greater, you may pay {X}, where X is the difference. If you do, put it onto the battlefield. If you don't, put it into its owner's graveyard. Then shuffle.

{T}, Sacrifice Urza's Bauble: Look at a card at random in target player's hand. You draw a card at the beginning of the next turn's upkeep.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I -- Urza's Saga gains "{T}: Add {C}."

II -- Urza's Saga gains "{2}, {T}: Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'"

III -- Search your library for an artifact card with mana cost {0} or {1}, put it onto the battlefield, then shuffle.

Sacrifice Welding Jar: Regenerate target artifact.