夢を穢すもの (Defiler of Dreams) (ja)
Creature - Phyrexian Sphinx | Power/Toughness: 4 / 3 (CMC 5)
As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay.
Whenever you cast a blue permanent spell, draw a card.