Cheapest priced copy (Innistrad: Double Feature): $0.99 at Card Kingdom, near mint, their price list as of .
Abraham Van Helsing 
Savior of Ollenbock
Creature — Human Soldier · 1/2 · Mythic · Innistrad: Crimson Vow · #330
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
Whenever this creature trains, exile up to one other target creature from the battlefield or creature card from a graveyard.
When this creature leaves the battlefield, put the exiled cards onto the battlefield under their owners' control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.99 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 301 | Mythic | $0.99 | $1.49 |
| Innistrad: Crimson Vow Promos | 34s | Mythic | — | $0.99 |
| Innistrad: Crimson Vow | 34 | Mythic | $0.99 | $0.99 |
| Innistrad: Crimson Vow (Abraham Van Helsing) | 330 | Mythic | $1.49 | $1.99 |
| Innistrad: Crimson Vow | 352 | Mythic | $0.99 | $0.99 |
3 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.
- 19 November 2021A creature “trains” when a +1/+1 counter is put onto it at as a result of its training ability resolving.