Leashling 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

Put a card from your hand on top of your library: Return this creature to its owner's hand.

Complete guide

Leashling is a quirky artifact creature from the Exodus set that offers a unique way to manipulate your hand and library. While its stats might seem modest for six mana, its activated ability provides a repeatable method to protect itself and set up your next draw.

What It Does

Leashling has a single activated ability: 'Put a card from your hand on top of your library: Return this creature to its owner's hand.' This is a self-bouncing mechanism that uses the library as a destination for your resources. Because the cost of the ability involves moving a card to your library, it allows you to 'save' a card from discard effects or simply clear Leashling from the battlefield to reuse its enter-the-battlefield effects later.

How It Resolves Step by Step

First, you announce the activation of Leashling's ability. Second, you pay the cost by choosing a card in your hand and placing it on top of your library; this is part of the cost and cannot be responded to. Third, the ability is put on the stack. Finally, when the ability resolves, Leashling returns to your hand. If Leashling leaves the battlefield before the ability resolves, the ability will still finish resolving, though it won't have a creature to return.

Common Mistakes

A frequent error is forgetting that putting a card on top of your library is a cost, not an effect. You must have at least one card in your hand to activate this ability. Additionally, players often forget that Leashling only returns to its owner's hand upon resolution of the ability, meaning opponents can still respond to the activation with instant-speed removal like a destroy effect.

When to Play It

Leashling is best utilized in decks that care about the top card of the library or decks that want to repeatedly trigger 'enters the battlefield' abilities. Since it returns itself to your hand, you can cast it multiple times to trigger other permanents' abilities that check for creatures entering the zone.

Interaction examples

Reusing Powerful Effects

Meteor Golem

If you have Meteor Golem on the field and it has already destroyed a permanent, you can use Leashling's ability to put a card on your library and return Leashling to your hand. While this doesn't directly affect Meteor Golem, it shows how Leashling can be re-cast to trigger cards that care about artifact creatures entering the battlefield, or simply to clear space.

Hand Size Synergy

Psychosis Crawler

If you control Psychosis Crawler, its power and toughness depend on your hand size. Activating Leashling's ability requires you to put a card from your hand onto your library, which momentarily shrinks the Crawler. However, once the ability resolves and Leashling returns to your hand, the hand size increases again, restoring the Crawler's stats.

Protecting the Pack

When an opponent targets Leashling with a spell that would destroy it, you can respond by activating its ability. By putting a card from your hand on top of your library, Leashling returns to your hand, causing the opponent's spell to lose its target and fail to resolve.

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