Frenzied Goblin (Multiple Times)?

[DarKLaVa888]

So With Frenzied Goblin, when it attacks, can you pay (R) more than once and target more than one creature? Or can you only pay (R) once and choose one target creature.

[jrsthethird]

Frenzied Goblin

No, you can only pay it once. The ability has one chance to trigger, that's when you declare attacks.

So after you choose him as an attacker, the ability goes on the stack, and you can decide whether to pay R or not.