Haystack is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

, : Target creature you control phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

Complete guide

Protecting your most valuable assets is a priority in any game of Magic, and Haystack offers a clever way to keep your creatures safe. By using the phasing mechanic, this artifact allows your creatures to temporarily vanish from the battlefield to dodge removal or board wipes. Understanding how phasing works is key to maximizing this card's defensive potential.

What Haystack Does

Haystack is a white artifact that provides a repeatable way to phase out your creatures. For a cost of two mana and tapping the Haystack, you can choose a creature you control to phase out. While phased out, the creature and everything attached to it, like Auras or Equipment, are treated as though they do not exist until your next untap step.

Resolving the Ability Step by Step

When you activate Haystack, you first pay the two mana and tap the artifact, then choose a legal target creature you control. Upon resolution, that creature phases out immediately. It stays on the battlefield but is ignored by all game effects; it cannot be targeted, damaged, or destroyed by spells like 'Wrath of God.' During your next untap step, before you untap your permanents, the creature phases back in automatically.

Common Mistakes to Avoid

A common misconception is that phasing triggers 'enters the battlefield' or 'leaves the battlefield' abilities. Because the creature never actually changes zones, these abilities will not trigger when a creature phases out or phases in. Additionally, phasing out a creature that is attacking or blocking will remove it from combat, which can be used strategically or as a drawback if timed poorly.

When to Activate Haystack

The best time to use Haystack is in response to your opponent's spells. If a player casts a destruction spell or a board wipe, you can activate Haystack to save your best creature. Since the creature phases in at the start of your untap step, it will be ready to attack or use its own activated abilities as soon as your turn truly begins.

Interaction examples

Fueling the Haystack

Sol Ring

With a Sol Ring on the battlefield, you can tap it to add two colorless mana, which exactly covers the activation cost of Haystack. This allows you to keep your white mana open for other spells while still having the protection of Haystack ready at any time.

Mana Fixing for Defense

Arcane Signet

If you are playing a multi-color deck, you can use Arcane Signet to produce the mana needed for Haystack's ability. By tapping Arcane Signet for mana and using one other mana source, you can activate Haystack during an opponent's turn to protect your commander from a targeted removal spell.

Basic Protection

If Haystack is your only non-land permanent besides a creature, you can simply pay two mana and tap it to phase your creature out. The creature will 'disappear' until your next untap step, effectively making it immune to any sorcery-speed removal your opponent might play on their turn.

Guide written with AI from the official text and rulings. Official English text prevails.