When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control." Tap an untapped artifact you control: Add {U}. {5}: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — This Saga gains "{T}: Add {C}." II — This Saga gains "{2}, {T}: Create a 0/0 colorless Construct artifact creature token with 'This token 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.

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.

Avoidance — Whenever you cast a noncreature spell, exile up to one target nonland permanent you control, then return that card to the battlefield under its owner's control.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

Take an extra turn after this one.

{T}: Add {C}{C}.

Target player takes an extra turn after this one.

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Trample, infect, indestructible If Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.

Return all permanents to their owners' hands.