Cheapest priced copy (Archenemy: Nicol Bolas): $0.35 at Card Kingdom, near mint, their price list as of .
Grasp of the Hieromancer 
Enchantment — Aura · Common · Archenemy: Nicol Bolas · #13
Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature attacks, tap target creature defending player controls."
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Archenemy: Nicol Bolas | 13 | Common | $0.35 | — |
| Magic Origins | 15 | Common | $0.35 | $0.49 |
| The List | E01-13 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 22 June 2015The enchanted creature is the source of the triggered ability it gains, not Grasp of the Hieromancer. If the enchanted creature isn’t white, that ability can target a creature with protection from white, for example.
- 22 June 2015The triggered ability granted to the enchanted creature will tap the creature before blockers are declared.