so im testing for a deck and i have out Jace's sanctum when i cast an instant or sorcery that lets me draw like Brainstorm if i play it correctly i will scry 1 before i get to draw any cards or any effect from a spell would take place?
Right. Everything that goes on the stack resolves last in, first out. That means that any spell that triggers Jace's Sanctum will resolve after the scry.
The Sanctum's trigger goes on the stack above the instant or sorcery spell that triggered it and will always resolve first. You will always scry 1 before you resolve the Brainstorm.
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DCI Level 2 Judge
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
BWTeysa, Orzhov Scion Combo
GUEzuri, Claw of progress Morph
GUBSidisi, Brood tyrant
RWGisela, Blade of Goldnight Random red white cards i dont use.dec
GBLoam Pox
Modern
UBFaeries
GBWGoyfless Abzan
On Squirrels
On Risen Executioner
Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one. But magicians have calculated that million-to-one chances crop up nine times out of ten.
BWTeysa, Orzhov Scion Combo
GUEzuri, Claw of progress Morph
GUBSidisi, Brood tyrant
RWGisela, Blade of Goldnight Random red white cards i dont use.dec
GBLoam Pox
Modern
UBFaeries
GBWGoyfless Abzan
On Squirrels
On Risen Executioner