Lightning Greaves [Secret Lair Drop Series] DP10 Can you use them efficiently

Can you use them efficiently to claim monuments and places of power before your rivals seize them

Whenever you cast an instant or sorcery spell from your hand

Set: EX: Emerald Type: Grass Rarity: Uncommon Retreat cost: Colorless

delighting in mischief and mayhem

Set: Secret Lair Drop Series Type: Legendary Creature — Human Soldier Rarity: Rare Cost: {1}{W}{U} Multikicker {W/U}

Lightning Greaves [Secret Lair Drop Series] DP10 Can you use them efficientlySet: Secret Lair Drop Series Type: Artifact Equipment Rarity: Rare Cost: {2} Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0} The boots demonstrated many strange magical properties, but the most remarkable was their ability to withstand Westley's ferocious chewing.