Enchantment
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Food is an artifact type. Even though it appears on some creatures, it's never a creature type.
You can't sacrifice a Food to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability.
Whatever you do, don't eat the delicious cards.
As Killer Service's second ability resolves, you may sacrifice any token, not just a Food token.
, 
, Sacrifice this token: You gain 3 life.") and sacrifice a token. If you do, create a 4/4 green Rhino Warrior creature token.