AI DraftFeb 26, 2026
Foundry Inspector + Mystic Forge + Sensei's Divining Top
Overview
With Mystic Forge on the battlefield you may cast artifact spells from the top of your library and Foundry Inspector reduces the mana cost of those artifact spells by 
when you cast them; the reduction is applied when the spell’s total cost is determined . Once you announce casting the artifact from the top, the game locks in the total cost and Ruling [2016-09-20] prevents players from removing Foundry Inspector before that cost is locked in. Sensei’s Divining Top can be used to put or reorder cards on top of your library to set up an artifact for Mystic Forge to let you cast, and Top’s draw ability can be used in interaction with its look ability per Ruling [2016-06-08]; be careful because drawing while a spell is being cast has special handling under .
when you cast them; the reduction is applied when the spell’s total cost is determined . Once you announce casting the artifact from the top, the game locks in the total cost and Ruling [2016-09-20] prevents players from removing Foundry Inspector before that cost is locked in. Sensei’s Divining Top can be used to put or reorder cards on top of your library to set up an artifact for Mystic Forge to let you cast, and Top’s draw ability can be used in interaction with its look ability per Ruling [2016-06-08]; be careful because drawing while a spell is being cast has special handling under .Step 1
With Mystic Forge on the battlefield you may look at the top card of your library at any time and may cast artifact spells from the top of your library using the normal casting process; the act of casting still follows the steps in .
Step 2
If the top card is an artifact and you choose to cast it via Mystic Forge, you announce casting the artifact and move it to the stack as described in ; at this point the game proceeds through the remaining casting steps including determining the total cost in .
Step 3
Foundry Inspector’s static ability reduces the mana component of the total cost of artifact spells you cast by , and that reduction is applied when the player determines the total cost under .
, and that reduction is applied when the player determines the total cost under .Step 4
Once you have announced casting the artifact, Ruling [2016-09-20] prevents players from taking actions to try to remove Foundry Inspector from the battlefield before that spell’s cost is locked in, so the cost reduction remains in effect for determining the locked-in total cost.
Step 5
After the total cost is locked in by completing the steps up through and paying costs per , the spell becomes cast as described in , and subsequent changes to continuous effects that would have affected the cost do not change the already-locked-in cost per .
Step 6
If you control Sensei’s Divining Top you can use its ability to look at and reorder the top three cards to put an artifact on top before casting, and you can use its 
draw ability to replace itself on top of your library; the Top-specific Ruling [2016-06-08] explains a common ordering where you tap to draw and replace and then use the look ability so that you end with the desired top card.
ability to look at and reorder the top three cards to put an artifact on top before casting, and you can use its draw ability to replace itself on top of your library; the Top-specific Ruling [2016-06-08] explains a common ordering where you tap to draw and replace and then use the look ability so that you end with the desired top card.Resolution
You may cast an artifact card from the top of your library thanks to Mystic Forge and Foundry Inspector reduces that artifact spell’s mana cost by when you determine the total cost to cast it ; after you announce casting the artifact, Ruling [2016-09-20] prevents removing Foundry Inspector before the cost is locked in, and if you use Sensei’s Divining Top to manipulate or draw cards during these actions you must respect the draw/looking timing rules such as and and the Top-specific Ruling [2016-06-08].
when you determine the total cost to cast it ; after you announce casting the artifact, Ruling [2016-09-20] prevents removing Foundry Inspector before the cost is locked in, and if you use Sensei’s Divining Top to manipulate or draw cards during these actions you must respect the draw/looking timing rules such as and and the Top-specific Ruling [2016-06-08].Feedback