Thats literally any kind of token, including treasure tokens - which are really easy to create thanks to the popularity of the mechanic, and cost nothing to sacrifice, too
usually Wizards of the Coast releases preview cards over the course of two weeks, but for this set theyve chosen to use an accelerated schedule that puts information on all of the cards into the hands of players in the course of a week - see our coverage articles from January 02, January 03, January 04, and January 05 for information on what Magic: The Gathering cards were a part of this preview season
Be sure to check out IGNs existing coverage of the new day-night cycle as well as new mechanics like Disturb, Decayed and Coven
Taken as a package, Jaws is surprisingly versatile
Im personally most excited about using Kaito to facilitate aggressive Dimir decks in conjunction with other Ninjas, but the looting ability allows the card to seamlessly fit the bill for Reanimator decks as well
Consider both a character's individual strength and how it synergizes with your other action cards