Cheapest priced copy (Innistrad Remastered): $1.29 at Card Kingdom, near mint, their price list as of .
Hopeful Initiate 
Creature — Human Warlock · 1/2 · Rare · Innistrad: Crimson Vow · #350
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
{2}{W}, Remove two +1/+1 counters from among creatures you control: Destroy target artifact or enchantment.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $0.99 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 287 | Rare | $1.79 | $3.49 |
| Innistrad Remastered | 27 | Rare | $1.29 | $0.99 |
| Innistrad Remastered | 343 | Rare | $1.29 | $0.99 |
| Innistrad: Crimson Vow Promos | 20p | Rare | $1.29Out of stock | $1.49 |
| Innistrad: Crimson Vow Promos | 20s | Rare | — | $1.29 |
| Innistrad: Crimson Vow | 20 | Rare | $1.29 | $0.99 |
| Innistrad: Crimson Vow | 350 | Rare | $1.29 | $1.49 |
2 rulings from Wizards of the Coast
- 19 November 2021A creature's training ability triggers only when both that creature and a creature with greater power are declared as attackers. Increasing a creature's power after attackers are declared won't cause a training ability to trigger.
- 19 November 2021Once a creature's training ability has triggered, destroying the other attacking creature or reducing its power won't stop the creature with training from getting a +1/+1 counter.