Teneb, the Harvester [Commander 2011] Standard Showdown Promos Hidden Ancients becomes a 5/5

Hidden Ancients becomes a 5/5 Treefolk creature

They only specify the consequences should you fail

Set: Weatherlight Type: Enchantment Rarity: Rare Cost: {2}{R}{R} Cumulative upkeep {2} (At the beginning of your upkeep

The ogre believes he's caught seven goblins

Teneb, the Harvester [Commander 2011] Standard Showdown Promos Hidden Ancients becomes a 5/5Set: Commander 2011 Type: Legendary Creature Dragon Rarity: Rare Cost: {3}{W}{B}{G} Flying Whenever Teneb, the Harvester deals combat damage to a player, you may pay {2}{B}. If you do, put target creature card from a graveyard onto the battlefield under your control.