When an enemy unit dies, Frenzied Omnivore gets +1/+1.
Summon: You may discard a card to give Frenzied Omnivore Killer.
Killer - A unit with Killer can make one special attack directly against an enemy unit. This can be done the turn it's played, and can target any unit, regardless of Flying, Aegis, or other special abilities.
Summon - Does something when played