
Artifact — Equipment
Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip

Equipment granting haste and hexproof for cheap protection.

Grants unblockable and shroud to protect a creature.

Equipment giving hexproof and a small boost to protect commanders.

Provides indestructible and free equip, protecting key creatures.

Grants hexproof-like protection to your commander cheaply.

Equipment granting indestructibility to keep creatures alive.

Gives indestructible and protection to equipped creature.

Protects creatures via persist as an alternative safeguard.
→ Infinite LTB, Infinite ETB, Infinite storm count
→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinitely large creature until end of turn
→ Infinite self-mill
→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinite blinking, Infinite ETB, Infinite LTB
You can't simply unequip Equipment from a creature. If Lightning Greaves is attached to the only creature you control, you won't be able to attach other equipment to it (or target it with anything else) until you have another creature to which you can attach Lightning Greaves.
If a creature enters the battlefield under your control and gains haste, but then loses it before attacking, it won't be able to attack that turn. This means that you can't use one Lightning Greaves to allow two new creatures to attack in the same turn.