Mystic Forge + Semblance Anvil + Sensei's Divining Top

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Overview

Sensei's Divining Top can arrange or change the top of your library while Mystic Forge lets you cast certain cards from that top; Semblance Anvil's imprint gives a static cost reduction to spells you cast that share a card type with the exiled card, and that reduction applies when you cast a card from the top of your library via Mystic Forge ([401.6], [601.2e]).

The StackRules & CitationsDetails & Edge Cases

Step 1

Before you cast anything, use Sensei's Divining Top's ability (or the Top's ability in the appropriate sequence described by the Top ruling) to arrange the top card you want on top of your library; Top lets you look at and reorder the top three cards ([401.6]).

Step 2

Verify whether Mystic Forge permits you to cast that top card: Forge only allows you to cast artifact spells and colorless spells from the top of your library (Mystic Forge oracle text). If the top card is not an artifact spell or a colorless spell, Forge does not allow you to cast it from the top ([601.2a]).

Step 3

If you decide to cast the top card and it is legal to cast from the top, announce you are casting that spell and move the card from the top of your library to the stack as the spell being cast ([601.2a]).

Step 4

Choose modes and targets as required by the spell ([601.2b], [601.2c]).

Step 5

Determine the total cost of the spell. Include the Semblance Anvil cost reduction now if the spell shares a card type with the card exiled by Anvil; that reduction reduces the total cost by (and if the spell shares multiple types, it is still only less per the ruling) ([601.2e]; Ruling [2011-01-01]).

Step 6

Activate mana abilities and then pay the total cost in full; once costs are locked in they can’t be changed ([601.2f], [601.2g]).

Step 7

After the costs are paid, the spell becomes cast and any "when a spell is cast" triggers occur ([601.2h]).

Step 8

If you activated Top's draw ability while casting such that you draw a card while another spell is being cast, remember that drawn card is kept face down until the spell becomes cast ([401.5]). Also, if the top card of your library changes while casting, the new top card won’t be able to be looked at until after the spell becomes cast ([401.6]).

Resolution

You may use Sensei's Divining Top to set the card you want on top of your library, Mystic Forge permits you to cast that top card if it is an artifact spell or a colorless spell, and Semblance Anvil will reduce the total cost of that spell by if the spell shares a card type with the card exiled by Anvil. Cost reductions are applied during cost determination and become locked in per the casting rules ([601.2e], [601.2a], [401.6]). The Anvil’s imprint is kept face up in exile by default ([406.3]).