%$&#?, God(dess) of Chaos

When %$&#?, God(dess) of Chaos enters the
battlefield, roll a D20. Its power and toughness is
equal to what you roll and the following happens:
1: You lose the game.
2-5: You lose 10 life and get 5 poison counters.
6-10: Your opponents get a Treasure token.
11-15: You get a Treasure token.
16-19: You gain 10 life and 5 Treasure tokens.
20: You win the game.
"Hey! I'm a Magic card! Wait... Why am I
just a common?"