Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Phase Dolphin 
Creature — Elemental Whale · 1/4 · Common · Ikoria: Lair of Behemoths · #62
Whenever this creature attacks, another target attacking creature can't be blocked this turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 62 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 17 April 2020If two Phase Dolphins attack at the same time, their abilities can target each other.
- 17 April 2020The target creature can’t be blocked this turn even if Phase Dolphin leaves the battlefield.