Once you have gained enough life to mill them out, get back to the starting position (a fresh Kiora you can cast and a Karn that can grab the Cauldron once more with one activation left
Standard Pokemon card reverse
Good examples would be Salamangreat Violet Chimera, which gets a powerful ability if you use a different Salamangreat Violet Chimera as material, or Dual Avatar - Manifested A-Un, which gets a range of different powerful effects for summoning with different Fusion monsters
That isn't so great, but in black, lots of creatures can die
They work with the common 100-card, 400-card, and 800-card box formats
From examining the holographic pattern to the micro-printing and card stock texture, professional graders ensure youre getting the real deal