Amy Rose 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

Haste Whenever Amy Rose attacks, attach up to one target Equipment to her. Then up to one other target attacking creature gets +X/+0 until end of turn, where X is Amy Rose's power.

Complete guide

Amy Rose is an aggressive legendary Hedgehog Warrior who brings speed and strategic gear-shifting to the battlefield. She excels at quickly equipping herself mid-combat and sharing her formidable strength with her allies to overwhelm your opponents.

Equipping on the Run

Amy Rose features a triggered ability that occurs whenever she attacks. You can target one Equipment you control and immediately attach it to her without paying its equip cost. Because this happens during the declare attackers step, the power bonus from that Equipment will be factored into the second part of her ability, which boosts another attacking creature.

Resolving the Trigger

The ability resolves in two main parts. First, you attach the target Equipment to Amy Rose. Second, another target attacking creature gains power equal to Amy Rose's current power at that specific moment. If Amy Rose leaves the battlefield before this ability resolves, her power is determined by her last known information on the battlefield.

Timing and Targeting

Note that you must choose both targets—the Equipment and the other attacking creature—at the same time when the ability is put onto the stack. If you don't have another creature attacking, you can still target the Equipment. However, if you choose not to target an Equipment, you can still give the power bonus to another creature.

Strategic Deployment

Since Amy Rose has Haste, she is a threat the moment she hits the table. Use her to bypass expensive equip costs on powerful artifacts, effectively 'cheating' the mana curve to deliver high-damage turns early in the game.

Interaction examples

Doubling the Hammer

Roaming Throne

If Roaming Throne enters the battlefield with 'Hedgehog' chosen as the creature type, Amy Rose's attack ability triggers twice. Each trigger allows you to attach a piece of Equipment and then buff a creature. This means you could attach two different Equipments to Amy Rose and give two different attacking creatures (or the same one twice) a massive power boost based on her increasing power.

The Golem Assault

Solemn Simulacrum

Suppose you attack with both Amy Rose and Solemn Simulacrum. You target an Equipment like a Sword on your battlefield to attach to Amy Rose. Once it is attached, her power increases. You then target Solemn Simulacrum for the second part of the ability. The Golem will receive a +X/+0 bonus where X is Amy Rose's new, higher power, making your utility creature a significant combat threat.

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