# 2023 Magic: The Gathering March of the Machine Promos #145s

> The 2023 Magic: The Gathering March of the Machine Promos card 145s, Invasion of Kaldheim // Pyre of the World Tree, is a rare foil Battle-Siege featuring a unique transform mechanic.

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## Identity

- **Year**: 2023
- **Brand**: Magic: The Gathering
- **Set**: March of the Machine Promos
- **Card Number**: 145s
- **Featured**: Invasion of Kaldheim // Pyre of the World Tree
- **Game**: Magic: The Gathering
- **Rarity**: Rare
- **Mana cost**: {3}{R}
- **Type**: Battle — Siege
- **Color**: R
- **Language**: English
- **Material**: Card Stock
- **Finish**: Foil

## Description

Invasion of Kaldheim // Pyre of the World Tree (Card Number 145s) is a foil rare from the 2023 March of the Machine Promos set in the Magic: The Gathering trading card game. Designed by Bryan Sola, this Battle-Siege card features a mana cost of {3}{R} and a mana value of 4. Players select an opponent to protect the siege upon entry, allowing multiple attackers to target it. Once defeated, the card exiles itself and transforms into its second face. The transformed side allows players to exile all cards from their hand and draw that many cards, enabling them to cast those exiled cards until the end of their next turn. This unique gameplay loop makes it a compelling addition to any Magic: The Gathering collection. Collectors appreciate the foil finish and the strategic depth of the transform mechanic. The card's rarity and promotional status add to its appeal for enthusiasts building their Magic sets.

## FAQ

### What is the mana cost of Invasion of Kaldheim // Pyre of the World Tree?

The mana cost is {3}{R}, requiring three generic mana and one red mana. This results in a total mana value of 4 for the card.

### How does the Battle-Siege mechanic work on this card?

When the Siege enters the battlefield, you choose an opponent to protect it. Other players can attack it. When it is defeated, it exiles and transforms into Pyre of the World Tree.

### Is this card part of a specific Magic: The Gathering set?

Yes, it is card number 145s from the March of the Machine Promos set, released in 2023. It is a rare foil promo card.

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Editorial content updated: 2026-10-06.

Site deployment: 2025-11-29.