# 2021 Magic: The Gathering Magic Online Promos #90066

> This 2021 Magic Online Promo foil card features the Rare Creature — Shade Warlock Author of Shadows, designed by Alex Brock.

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## Identity

- **Year**: 2021
- **Brand**: Magic: The Gathering
- **Set**: Magic Online Promos
- **Card Number**: 90066
- **Featured**: Author of Shadows
- **Game**: Magic: The Gathering
- **Rarity**: Rare
- **Mana cost**: {4}{B}
- **Type**: Creature — Shade Warlock
- **Power / Toughness**: 3 / 3
- **Color**: B
- **Language**: English
- **Material**: Card Stock
- **Finish**: Foil

## Description

The 2021 Magic Online Promos release features Author of Shadows, card number 90066. This Rare foil card is a black Creature — Shade Warlock with a mana cost of {4}{B} and a mana value of 5. The card was illustrated by artist Alex Brock, whose artwork defines the visual identity of this promo edition. As a promo item, it holds a distinct place within the Magic Online Promos subset, separate from standard set releases.

In gameplay, Author of Shadows brings a significant impact to the table. When this creature enters the battlefield, it exiles all opponents' graveyards. The controller then chooses a nonland card from among those exiled cards. For as long as the chosen card remains exiled, the controller may cast it and may spend mana as though it were mana of any color to cast that spell. This ability provides immense flexibility, allowing players to leverage cards that might otherwise be inaccessible during a match.

Collectors of Magic: The Gathering trading cards often track promo cards from various years to build comprehensive libraries. The foil finish of this card adds a tactile and visual layer that distinguishes it from non-foil base cards. The combination of its rare status, foil treatment, and potent rules text makes it a notable entry for enthusiasts of the game.

For those interested in the history of Magic Online Promos, this card serves as a clear example of the interactive and powerful effects introduced in 2021. Its design and rules text reflect the creative direction of the game during that period. Collectors may find value in acquiring this card to complete their sets of promo releases or to add a powerful tool to their digital or physical collections.

## FAQ

### What is the mana cost of Author of Shadows?

The mana cost for Author of Shadows is {4}{B}, requiring four generic mana and one black mana. This results in a total mana value of 5.

### What does the Author of Shadows card do?

When Author of Shadows enters the battlefield, it exiles all opponents' graveyards. You then choose a nonland card from among those exiled cards and may cast it for as long as it remains exiled, spending mana as though it were any color.

### Who illustrated the Author of Shadows promo card?

The artwork for this Magic Online Promo card was created by artist Alex Brock. The illustration is featured on the 2021 foil release of the card.

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Editorial content updated: 2026-10-07.

Site deployment: 2025-11-29.