Derevi, Empyrial Tactician [Commander 2013] Explorer the only caste that cannot

the only caste that cannot be attained by either heredity or money is that of the hero

Set: Limited Edition Beta Type: Artifact Rare Cost: {4} {2}

you may transform Dowsing Dagger

Set: Mirrodin Type: Artifact Rare Cost: {2} Whenever a permanent becomes untapped

Derevi, Empyrial Tactician [Commander 2013] Explorer the only caste that cannotSet: Commander 2013 Type: Legendary Creature Bird Wizard Mythic Cost: {G}{W}{U} Flying Whenever Derevi, Empyrial Tactician enters the battlefield or a creature you control deals combat damage to a player, you may tap or untap target permanent. {1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone.