Urza Block

Urza Block (Visual)

Everything is from Urza block.
There is no 5-color identity Legendary Creature from Urza block, so I punted and use Fertile Ground (since it references "any color" at least).
If someone ever were to balk at it (no one ever does), I would go off-theme and use Sliver Queen.

General (1):
Fertile Ground

Creatures (27):
Beast of Burden Karn, Silver Golem Dark Hatchling Phyrexian Plaguelord Skirge Familiar Archivist Aura Thief Blizzard Elemental Great Whale Morphling Palinchron Peregrine Drake Temporal Adept Citanul Hierophants Elvish Piper Multani, Maro-Sorcerer Thorn Elemental Weatherseed Treefolk Yavimaya Wurm Lightning Dragon Shivan Hellkite Shivan Phoenix Viashino Heretic Intrepid Hero Karmic Guide Radiant, Archangel Serra Avatar

Spells (28):
Barrin's Codex Chimeric Staff Citanul Flute Crawlspace Memory Jar Phyrexian Processor Temporal Aperture Urza's Blueprints Attrition No Mercy Pestilence Phyrexian Reclamation Yawgmoth's Will Opportunity Opposition Rewind Stroke of Genius Time Spiral Windfall Abundance Compost Defense of the Heart Greater Good Angelic Chorus Glorious Anthem Opal Archangel Serra's Liturgy Worship

Mana Acceleration (8):
Thran Dynamo Argothian Elder Carpet of Flowers Grim Monolith Lotus Blossom Worn Powerstone Yavimaya Elder Priest of Titania

Lands (36):
Drifting Meadow Polluted Mire Remote Isle Slippery Karst Smoldering Crater Faerie Conclave Forbidding Watchtower Ghitu Encampment Spawning Pool Treetop Village Gaea's Cradle Phyrexian Tower Serra's Sanctum Shivan Gorge Yavimaya Hollow Swamp Swamp Swamp Swamp Island Island Island Island Island Island Forest Forest Forest Forest Forest Forest Mountain Mountain Plains Plains Plains

Sideboard (Omitted/Cut card ideas):
Covetous Dragon Levitation Ancient Silverback