Vish Kal, Blood Arbiter Vish Kal, Blood Arbiter might be expensive, but it has two powerful activated abilities that dont cost mana and dont have timing restrictions
Captain Howler, Sea Scourge
The easy sacrifice outlet is very relevant since you'll put Yahenni through the combat phase if all goes well
Magic's best pirate, Ragavan's a huge part of multiple Modern builds and is so powerful that it was banned in Legacy and Historic
This card fits somewhat awkwardly into the current Green-White shell, Adventures, but I see a lot of solid support for an aggressive Constellation shell, and this is by far the best card to enable that strategy
Varolz feel like he struggles to impress more than the many other three mana options