Tetravus [Antiquities] Guildpact where X is that spell's

where X is that spell's mana value

add {B} for each charge counter on Black Market

Untap that creature

Serendib Djinn deals 3 damage to you

Tetravus [Antiquities] Guildpact where X is that spell'sSet: Antiquities Type: Artifact Creature Construct Rarity: Rare Cost: {6} Flying Tetravus enters the battlefield with three +1 +1 counters on it. At the beginning of your upkeep, you may remove any number of +1 +1 counters from Tetravus. If you do, create that many 1 1 colorless Tetravite artifact creature tokens. They each have flying and "This creature can't be enchanted." At the beginning of your upkeep, you may exile any number of tokens created