Thopter Squadron 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

Flying This creature enters with three +1/+1 counters on it. , Remove a +1/+1 counter from this creature: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only as a sorcery. , Sacrifice another Thopter: Put a +1/+1 counter on this creature. Activate only as a sorcery.

Complete guide

Thopter Squadron is a versatile artifact creature that acts as a mother ship for a mechanical fleet. It enters the battlefield with three +1/+1 counters, allowing you to deploy individual Thopter tokens or reabsorb them to grow larger. Balancing its size against its utility is key to mastering this classic engine.

Converting Counters to Tokens

The primary function of Thopter Squadron is to transform its internal power into a swarm. By paying one mana and removing a +1/+1 counter, you create a 1/1 colorless Thopter artifact creature token with flying. It is important to note that both of Thopter Squadron's activated abilities can only be used when you could cast a sorcery, meaning you cannot swap counters for tokens during your opponent's turn or in response to a removal spell.

Reabsorbing Your Fleet

If you have excess Thopters on the board, Thopter Squadron can 're-dock' them. By paying one mana and sacrificing another Thopter, you place a +1/+1 counter back onto Thopter Squadron. This sacrifice is part of the cost, so once you announce the ability, your opponent cannot kill the Thopter token in response to prevent the counter from being placed.

Timing and Strategy

Because both abilities are limited to sorcery speed, you must plan your turn carefully. You cannot use the tokens as surprise blockers and then sacrifice them back to the Squadron after damage is dealt. However, this card is excellent for triggering 'enters the battlefield' or 'dies' effects by repeatedly creating and sacrificing tokens during your main phase.

Interaction examples

Deploying the Swarm

Thopter

With Thopter Squadron on the battlefield, you pay one mana and remove a counter during your main phase. The ability resolves and creates a 1/1 Thopter token. You now have a 2/2 Squadron and a 1/1 token, both with flying. If you have more mana, you can repeat this until the Squadron has no counters left, effectively trading a 3/3 body for three 1/1 bodies.

Interaction with Non-Thopters

Solemn Simulacrum

You have Thopter Squadron and Solemn Simulacrum on the field. You attempt to use Thopter Squadron's second ability to sacrifice Solemn Simulacrum. This is an illegal move because the ability specifically requires sacrificing 'another Thopter.' Since Solemn Simulacrum is a Golem, it cannot be used to grow the Squadron.

The Power of Typing

Roaming Throne

If you play Roaming Throne and choose 'Thopter,' it becomes a Thopter in addition to its other types. While Roaming Throne's double-trigger ability does not affect Thopter Squadron's activated abilities, Thopter Squadron can now sacrifice Roaming Throne using its second ability because the Throne is now a Thopter. This would put one +1/+1 counter on the Squadron.

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