When can I activate the Equip ability?

Only during your main phase when the stack is empty, the same timing as casting a sorcery, since the Equip ability has that restriction.

What happens to an Equipment when its equipped creature dies?

The Equipment stays on the battlefield unattached; you can later pay the Equip cost again to attach it to another creature you control.

What is the best Equip card?

By popularity, Equip is among the most-played Equip cards — see the full ranked list above.

Best Equip cards in MTG

Equip: Equip is an activated ability that lets you attach an Equipment to a creature you control, and can only be activated at sorcery speed.

Equipment provides reusable bonuses that survive their wearer's death, letting you move the buff to a new creature, which makes them more resilient than Auras. They shine in aggressive and Voltron decks where you reattach gear after removal. Watch the Equip cost, since repeatedly moving Equipment can be mana intensive.

FAQ

When can I activate the Equip ability?: Only during your main phase when the stack is empty, the same timing as casting a sorcery, since the Equip ability has that restriction.
What happens to an Equipment when its equipped creature dies?: The Equipment stays on the battlefield unattached; you can later pay the Equip cost again to attach it to another creature you control.
What is the best Equip card?: By popularity, Equip is among the most-played Equip cards — see the full ranked list above.