On average, instants and sorceries make up 10% of The Ur-DragonThe Ur-Dragon decks, 17% of Scion of the Ur-DragonScion of the Ur-Dragon decks, and 11% of Lathliss, Dragon QueenLathliss, Dragon Queen decks
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If you have better dual lands (anything from Polluted Delta to Watery Grave to Drowned Catacomb to Clearwater Pathway), adding them to the deck over the current duals (starting with Temple of Deceit and Choked Estuary) will improve the deck, although I probably wouldn't run out and spend hundreds of dollars on lands just to upgrade Dimir Thieves
Its a cheap tutor effect for a specific type of card, but its a type of card that blue decks love to cast
PSA 10 often 23x raw on icons