Clockwork Icosahedron

Whenever you lose life, roll d20: (0-1): Lose
2d6 life and roll again. (2-3): Add 1d4 colorless
mana to your mana pool. (4-5): Gain 1d8 life.
(6-7): Discard your, hand draw seven cards.
(8-9): Creatures you control gain Haste.
(10-11): Lose 1d6 life and roll again. (12-13):
Add 2d4 colorless mana to your mana pool.
(14-15): Gain 2d8 life. (16-17): Target player
loses a turn, you gain that turn. (18-19):
Creatures you control gain Trample. (20):
Defending creatures gain Double Damage.