# 2020 Magic: The Gathering Aether Revolt Promos #49p

> The Whir of Invention promo card (49p) from the 2020 Magic: The Gathering Aether Revolt Promos set. This instant spell features the improvise mechanic and a mana cost of {X}{U}{U}{U}.

The Whir of Invention promo card (49p) from the 2020 Magic: The Gathering Aether Revolt Promos set. This instant spell features the improvise mechanic and a mana cost of {X}{U}{U}{U}.

Canonical URL: https://supercatch.com/product/magic-the-gathering-aether-revolt-promos-whir-of-invention-49p-promo

## Identity

- **Year**: 2020
- **Brand**: Magic: The Gathering
- **Set**: Aether Revolt Promos
- **Card Number**: 49p
- **Featured**: Whir of Invention
- **Game**: Magic: The Gathering
- **Rarity**: Rare
- **Mana cost**: {X}{U}{U}{U}
- **Type**: Instant
- **Color**: U
- **Language**: English
- **Material**: Card Stock
- **Finish**: Normal

## Description

The Whir of Invention promo card (49p) from the 2020 Magic: The Gathering Aether Revolt Promos set offers a distinct gameplay experience through its unique casting cost and ability. Classified as a Rare card within the PAER set code, this instant spell requires a mana cost of {X}{U}{U}{U} and has a mana value of 3. The card's design is attributed to artist Christine Choi, adding to its identity among collectors of the Aether Revolt era. Gameplay for this card centers on the improvise mechanic, allowing players to tap artifacts to help pay for the spell's generic mana. Once cast, the card enables the player to search their library for an artifact card with a mana value of X or less, put it onto the battlefield, and then shuffle their library. This functionality makes it a strategic choice for decks focusing on artifact synergy. The 2020 Aether Revolt Promo card Whir of Invention (49p) is an Instant with mana cost {X}{U}{U}{U}. The 49p card number places this variant within the promotional subset, distinguishing it from the base checklist. As a blue-colored card with a color identity of U, it fits into specific deck archetypes that prioritize artifact acceleration. Its rules text allows you to search your library for an artifact card with mana value X or less, put it onto the battlefield, and then shuffle.

## FAQ

### What is the mana cost of Whir of Invention?

The mana cost for Whir of Invention is {X}{U}{U}{U}. This means the player must pay X generic mana along with three blue mana symbols to cast the spell.

### How does the improvise mechanic work on this card?

The improvise mechanic allows you to tap any number of artifacts you control after activating mana abilities. Each tapped artifact pays for {1} of the spell's total cost.

### Who is the artist for the 49p promo card?

The artist for the Whir of Invention promo card (49p) is Christine Choi. She provided the illustration for this card in the Aether Revolt Promos set.

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Editorial content updated: 2026-10-02.

Site deployment: 2025-11-29.