Tamiyo's NotebookHow it works & interactions with other cards

Constant Advantage

Tamiyo's Notebook has two distinct abilities. The first is a static ability that reduces the cost of every spell you cast by two generic mana. This applies to creatures, artifacts, enchantments, planeswalkers, and sorceries or instants. The second is an activated ability that allows you to tap the artifact to draw a card, ensuring you always have spells to cast with your new discount.

Step-by-Step Resolution

When you activate the -7 loyalty ability of Tamiyo, Compleated Sage, the ability goes on the stack. Once it resolves, you create the legendary colorless Book artifact token named Tamiyo's Notebook. From that moment forward, the cost reduction is active. Whenever you cast a spell, you calculate the cost by taking the total mana cost or alternative cost, adding any cost increases, and then applying the {2} reduction from the Notebook before effects like Trinisphere are applied.

Common Pitfalls

A common mistake is assuming the Notebook reduces activated ability costs, such as Equip or Crew; it only reduces the cost to cast spells. Additionally, because it is a legendary permanent, if you manage to create a second copy of Tamiyo's Notebook, you will have to choose one to keep and put the other into your graveyard due to the 'legend rule.' Finally, remember that cost reductions cannot reduce the colored mana requirements of a spell, only the generic portion.

When to Deploy

Since the Notebook is a token created by a planeswalker's ultimate ability, your primary goal is to protect Tamiyo, Compleated Sage until she reaches 7 loyalty. Once the Notebook is on the field, it is often best to use the draw ability during your opponent's end step to keep your options open, unless you need to find a specific land or cheap spell to play during your own turn.

Interaction examples

Accelerating the Early Game

Tamiyo, Compleated SageSol Ring

If you have already used Tamiyo, Compleated Sage to create Tamiyo's Notebook, casting a Sol Ring becomes free. The Notebook reduces the {1} cost of Sol Ring to {0}. This allows you to save your mana for other spells while still developing your board presence.

Equipping for Less

Skullclamp

When you cast Skullclamp while Tamiyo's Notebook is on the battlefield, the {1} casting cost is reduced to {0}. However, note that the Notebook does not reduce the cost of the Equip {1} ability, as that is an activated ability and not a spell being cast.

Reaching the Ultimate

Tamiyo, Compleated Sage

You can cast Tamiyo, Compleated Sage by paying {G}{U} and 2 life due to her Compleated ability. If you do, she enters with 3 loyalty. You will need to use her +1 ability across several turns to reach the 7 loyalty required to create Tamiyo's Notebook, which then provides the permanent {2} discount for the rest of the game.