I can see an argument for having it be S-Tier (the ability to sacrifice a creature for free to draw a card is super powerful, potentially enough for it to show up in multiple decks) or even B-Tier (while various Sacrifice decks seem like the most obvious home, it's possible that the lists are so tight that it will be hard to find room for Yawgmoth, Thran Physician)
It's a rarer situation, but Mind Flayer is probably one of the most potent answers to a Grenzo, Dungeon deck that likes to play things from the bottom of its library
As such I am surprised I haven't seen this used as part of some Upheaval plan as yet and feel that it deserves an honorary last spot on the list
Raigeki destroys all monsters your opponent controls, regardless of their battle positions
The example blanks also have a gradient background so you can see what parts of it are transparent or not: And that's about it
If heads, this attack does 50 more damage