Oath of Druids [Commander 2016] Cosmo Blazer You can only use this

You can only use this effect of "Glow-Up Bulb" once per Duel

Set: Sun & Moon: Burning Shadows Type: Darkness Rarity: Promo Retreat cost: Colorless

Set: HeartGold & SoulSilver: Base Set Type: Grass Rarity: Ultra Rare Retreat cost: Colorless

Set: EX: Dragon Frontiers Type: Fire Rarity: Common Retreat cost: Colorless

when your opponent activates a card or effect by declaring exactly 1 card name

Oath of Druids [Commander 2016] Cosmo Blazer You can only use thisSet: Commander 2016 Type: Enchantment Rarity: Rare Cost: {1}{G} At the beginning of each player's upkeep, that player chooses target player who controls more creatures than they do and is their opponent. The first player may reveal cards from the top of their library until they reveal a creature card. If the first player does, that player puts that card onto the battlefield and all other cards revealed this way into their graveyard.