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'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}:...
'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}:...
'Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return the chosen cards to the battlefield tapped.
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
'{T}: Add {C}.
{3}, {T}, Sacrifice this land: Search your library for a land card, put it onto the battlefield tapped, then shuffle.
'Echo {6} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) {T}:...
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.
'Kicker {8}{R} (You may pay an additional {8}{R} as you cast this spell.) This spell can't be countered. Urza's Rage deals 3 damage to any target. If this spell was...
'(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.
'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}:...
'(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},...