If it's tails, the attack will fail
Hybrid cards allow us to get multicolor cards at one mana, so Deathrite Shaman is taking advantage of this (and you'll notice we tend to do a bunch of one-drop hybrid cards in Ravnica sets because of this)
309.5a: If a player ventures into the dungeon while they own a dungeon card in the command zone and their venture marker isnt on that dungeons bottommost room, they move their venture marker from the room it is on to the next room, following the direction of an arrow pointing away from the room their venture marker is on
Ive personally played similar lists to this Lost Zone Giratina VSTAR deck to a handful of League Cups in Toronto, and this is my personal list right now
It is some pretty silly Sword of the Meek wordplay, and it offers some support to all the rodent creature types
The artifact creature typing provides additional synergies with whites artifact support while remaining vulnerable to creature removal