The Demogorgon

Double Strike, Annihilator 2, Menace, Reach

The Demogorgon attacks each turn if able.

At the beginning of your up-keep, each opponent
mills X or you draw X cards.(They choose and X is
equal to the number of differently named dungeons
you've completed.)
Discard two cards: The Demogorgon gains Shroud
or Indestructible until end of turn.(Activate only
once per turn.)