Nightmare's Whispers

Surveil 2. If a card is put into your
graveyard this way, create 2 X/X
Nightmare creature tokens where
X is that card's mana value. You may
pay 3 life rather than pay the cost of
this card. If you do, create X X/X
Nightmare creature tokens instead.
If you control a legendary pony creature,
You may cast this spell from your graveyard.
If you do, exile it.
There is a reason why Envy is a deadly sin.