Trample
When Fierce Witchstalker enters the battlefield, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")
Food is an artifact type. Even though it appears on some creatures (such as Gingerbrute), it's never a creature type.
Whatever you do, don't eat the delicious cards.
You can't sacrifice a Food token to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate the ability of Tempting Witch.