Frenzy

Frenzy is a triggered keyword ability. The rules for frenzy are as follows:

502.66. Frenzy

502.66a Frenzy is a triggered ability. "Frenzy N" means "Whenever this creature attacks and isn't blocked, it gets +N/+0 until end of turn."

502.66b If a creature has multiple instances of frenzy, each triggers separately.