Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.49 at Card Kingdom, near mint, their price list as of .
Pursued Whale 
Creature — Whale · 8/8 · Rare · Commander Legends: Battle for Baldur's Gate · #732
When this creature enters, each opponent creates a 1/1 red Pirate creature token with "This token can't block" and "Creatures you control attack each combat if able."
Spells your opponents cast that target this creature cost {3} more to cast.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 732 | Rare | $0.49 | — |
| Core Set 2021 | 60 | Rare | $0.49 | $0.49 |
| Core Set 2021 | 351 | Rare | $0.99 | $0.49 |
| Core Set 2021 Promos | 60p | Rare | $0.49 | $0.49 |
| Core Set 2021 Promos | 60s | Rare | — | $0.79 |
2 rulings from Wizards of the Coast
- 23 June 2020To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases (such as that of Pursued Whale), then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
- 23 June 2020If a creature affected by the Pirate token can't attack for any reason (such as being tapped or having come under that player's control that turn), then it doesn't attack. If there's a cost associated with having it attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either.