Guildmark [Unknown Event] Plains sacrifice Contamination unless you sacrifice

sacrifice Contamination unless you sacrifice a creature

If you would put one or more counters on a permanent or player

Set: Zendikar Rising Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {4} {2}

Set: Unknown Event Type: Instant Rarity: Common Untap Convoke (Each tapped creature that you untap while casting this spell pays for 1 or one mana of that creature's color

only chance

Guildmark [Unknown Event] Plains sacrifice Contamination unless you sacrificeSet: Unknown Event Type: Artifact Rarity: Common Pledge (Join a two colored guild if you haven't already this game.) T: Add one mana of one of your guild's colors.