Reki, the History of Kamigawa (142) [The List Reprints] SM03 you can negate the activation

you can negate the activation of 1 Spell Card and destroy the Spell Card by discarding 1 card from your hand

You’ve found the cures to four deadly diseases

also this card gains ATK equal to that opponent's monster's ATK

Gain control of the equipped monster

Reki, the History of Kamigawa (142) [The List Reprints] SM03 you can negate the activationSet: Mystery Booster Type: Legendary Creature Human Shaman Rarity: Rare Cost: {2}{G} Whenever you cast a legendary spell, draw a card. "After his death, monks spent ten years transcribing the tattoos from Reki's body and gathering stories from those who spoke with him. Thus the volume you hold was written." *The History of Kamigawa*