Reki, the History of Kamigawa [Saviors of Kamigawa] Hidden Legends Take delivery of Witchcrafter Golem

Take delivery of Witchcrafter Golem Aruru and you can upgrade any Spellcaster-based Deck with a monster that hides in your hand until your opponent targets your Spellcaster with an attack

and vigilance

Guess right and Win

Whenever you cast an Eldrazi creature spell with mana value 7 or greater

Reki, the History of Kamigawa [Saviors of Kamigawa] Hidden Legends Take delivery of Witchcrafter GolemSet: Saviors of Kamigawa 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*