Tome of the InfiniteHow it works & interactions with other cards

Conjuring from the Spellbook

When you activate the ability of Tome of the Infinite, you conjure one of ten specific cards from its internal spellbook into your hand. These cards are created out of thin air; they are not drawn from your library. The available cards include powerful low-cost spells like Ancestral Recall, Dark Ritual, Lightning Bolt, and Swords to Plowshares.

Understanding Prismatic and Perpetual Effects

The most important part of this ability is that the conjured card perpetually gains prismatic. 'Perpetual' means the card keeps this quality regardless of where it moves—even if it goes to the graveyard or back to your hand. 'Prismatic' allows you to spend mana as though it were mana of any color to cast that specific spell, ensuring that a Blue deck can easily cast a conjured Red Lightning Bolt.

Strategic Activation

Because the ability requires tapping the Tome, you are usually limited to one new spell per turn cycle. To maximize its value, you should activate it during your opponent's end step if you have open mana, or during your own main phase if you are looking for a specific utility spell to progress your board state.

Common Pitfalls

Remember that while you can spend mana of any color to cast the conjured spell, you still must follow all normal timing rules for that card. If you conjure a Ponder, you can only cast it during your main phase when the stack is empty. Additionally, if Tome of the Infinite leaves the battlefield, any cards already conjured into your hand remain there and keep their prismatic quality.

Interaction examples

Speeding Up the Knowledge

Swiftfoot Boots

Normally, you must wait a turn to use an artifact's tap ability if it were a creature, but artifacts don't have summoning sickness. However, if Tome of the Infinite becomes a creature, equipping Swiftfoot Boots grants it haste, allowing you to pay {U} and tap it immediately the turn it enters the battlefield to conjure your first spell.

Fixing Your Mana

Arcane Signet

If you conjure a Dark Ritual (which costs {B}) using the Tome, the prismatic ability allows you to use the Blue mana generated by your Arcane Signet to pay for it. Even though Arcane Signet might only produce Blue in a mono-Blue Commander deck, the perpetual prismatic effect on the conjured card overrides the color requirement.