Cheapest priced copy (Jumpstart 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Weight of Conscience 
Enchantment — Aura · Common · Morningtide · #28
Enchant creature
Enchanted creature can't attack.
Tap two untapped creatures you control that share a creature type: Exile enchanted creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 265 | Common | $0.35 | — |
| Morningtide | 28 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 April 2008Since the activated ability doesn’t have a tap symbol in its cost, you can tap creatures that haven’t been under your control since your most recent turn began to pay the cost.
- 1 April 2008The ability exile the enchanted creature, but Weight of Conscience remains on the battlefield. The Aura will then be put into your graveyard as a state-based action.