Necropotence [From the Vault: Exiled] Spirit Cleric you can send this card

you can send this card from your hand to the Graveyard to have that monster gain ATK equal to the ATK of the opponent's monster it is battling

Set: Duelist League Promo Card type: Rock/Effect Monster Rarity: Rare Attack: 700 Defense: 600 FLIP: Both players discard all the cards in their hands

"The echo of silence is music to my ears

You can also Xyz Summon this card by using a Rank 4 "Utopia" monster you control as the Xyz Material

Whereas Mishra works in metals and stone

Necropotence [From the Vault: Exiled] Spirit Cleric you can send this cardSet: From the Vault: Exiled Type: Enchantment Rarity: Mythic Cost: {B}{B}{B} Skip your draw step. Whenever you discard a card, exile that card from your graveyard. Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.