mtg 30th anniversary booster box Destroy Evil Deckbox The Gathering cards of which at least MTG: 30th Anniversary Edition -

Mickey Mouse Food Fight Defender is excellent here, or the new Clarabelle Clumsy Guest also give you some flexibility against items

I would say the answer is yes

Think of Ureni as the Dragon that asks: "Why cast when you can just attack and get a winged beastie for free?" Must Includes: Broodcaller Scourge - Another dragon that cheats stuff into play

Thats when you can sacrifice it to pick up some extra cards from your library

Typically these are used in concert with discard effects in decks with heavy graveyard synergy as you will want specific things in the bin and wont be able to control whether you draw them or not