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But a cost reducer that hits both equipment and their equip cost is exactly what an equipment deck wants

it converts existing demand into self-service revenue at hours and locations where a staffed counter cannot cover the transaction

They also won't gain or lose any land types

By attaching a Warrior from the grave as an Equip Spell to Red-Eyes Slash Dragon, you have a negate that can be used to stop any effect that targets another card

In the early days, Elsik and company ran Bow of Nylea in the sideboard to add counters to opposing Hierarchs and Signal Pests for this reason, a counterintuitive but effective way to stop creatures with zero base power from attacking