Doubling Season [Commander Masters] World Championships 2012 you may play the top

you may play the top card of their library

Set: Gym Heroes 1st Edition Type: Lightning Rarity: Holo Rare Retreat cost: Colorless

and library for all cards with the same name as that artifact and exile them

Set: Sun & Moon: Hidden Fates - Shiny Vault Type: Dragon Rarity: Ultra Rare Retreat cost: 0

Doubling Season [Commander Masters] World Championships 2012 you may play the topSet: Commander Masters Type: Enchantment Rarity: Mythic Cost: {4}{G} If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.