Yuriko may have single-handedly been the proof Wizards needed to bring us back to Kamigawa
If Totentanz, Swarm Piper dies at the same time as one or more other nontoken creatures you control, Totentanz's ability triggers for each of them
If you are not super comfortable with that just yet, you will want to identify what exactly your decks goal is before you begin building
Additionally, if your deck has a lot of card draw or even just manipulation (your Commander Scrys or draws, for example, or you're Mono-Blue with a ton of cantrips and Ponder-style effects), you can adjust your number
We picked up a few other smaller upgrades like Vanquisher's Banner, World Breaker, and Command Tower
This effect absolutely isnt worth 3 mana, especially since graveyard hate is so prevalent, even as an ETB on something else