Jodah's Codex 5
Artifact (Uncommon) Domain — 5, T: Draw a card. This ability costs 1 less to activate for each basic land type among lands you control. "If there is one thing to remember in the history of our world, it is this: the Phyrexians can be defeated."
—Jodah
Domain Tome's card draw ability requires 2 basics (so regular Limited things) to get to the same cost as an Urza's Tome with another historic permanent on the battlefield. Depending on how easy it is to get domain to 5 in Limited, this thing might not just be a desperation card draw spell.
Jodah's Codex 5
Artifact (Uncommon)
Domain — 5, T: Draw a card. This ability costs 1 less to activate for each basic land type among lands you control.
"If there is one thing to remember in the history of our world, it is this: the Phyrexians can be defeated."
—Jodah
Domain Tome's card draw ability requires 2 basics (so regular Limited things) to get to the same cost as an Urza's Tome with another historic permanent on the battlefield. Depending on how easy it is to get domain to 5 in Limited, this thing might not just be a desperation card draw spell.
Source: Santosvella
"Demesne of Domains
Land
Demesne of Domains enters the battlefield tapped.
Demesne of Domains is all basic land types."
Anyway, this could ridiculous pretty quickly with Triomes. No wonder it costs 5.
You just need 3 shocks or 2 triomes and it straight up becomes Urza's Blueprints without the echo cost