Sword of Feast and Famine [Mirrodin Besieged] Divine-Beast the player can activate mana

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

You can only use this effect of "Medusa

you may copy that spell

When you Ritual Summon a monster

Sword of Feast and Famine [Mirrodin Besieged] Divine-Beast the player can activate manaSet: Mirrodin Besieged Type: Artifact Equipment Rarity: Mythic Cost: {3} Equipped creature gets +2 +2 and has protection from black and from green. Whenever equipped creature deals combat damage to a player, that player discards a card and you untap all lands you control. Equip {2}