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Once its equipped, it gives the creature +3/+3, vigilance, and then you can tap and sacrifice the creature to add three mana of one color
If you're not in the mood to attack, or your opponent doesn't block as you wanted, Wilhelt gives you the option to sacrifice a Zombie
For Penny sleeves, the damage seems to be mitigated by avoiding pinching the sleeves to remove the card I always though that this was better to avoid the surface of the sleeves getting into contact with the holo while inserting / removing the cards but this is super detrimental for the backs
Additional Food Cards Cards like Greta, Sweettooth Scourge, Night of the Sweets' Revenge, and Tough Cookie are ways to get the most out of your Food tokens