Avacyn, Angel of Hope [Double Masters] Mythic Edition But where is the source

But where is the source

Set: Mystery Booster Type: Sorcery Rarity: Uncommon Cost: {1}{B} Search your library for a card

"If there can be no victory

If you've cycled a card named Yidaro

Set: Limited Edition Beta Type: Creature — Wall Rarity: Uncommon Cost: {1}{U}{U} Defender

Avacyn, Angel of Hope [Double Masters] Mythic Edition But where is the sourceSet: Double Masters Type: Legendary Creature Angel Rarity: Mythic Cost: {5}{W}{W}{W} Flying, vigilance, indestructible Other permanents you control have indestructible. A golden helix streaked skyward from the Helvault. A thunderous explosion shattered the silver monolith and Avacyn emerged, free from her prison at last.