Bargians in Hell's Office

{t}, Sacrifice a creature: Create X-1 artifact Gold
tokens with "Sacrifice this artifact: Add one mana
of any color." Where X is the creature's
converted mana cost.
{b}{b},{t}: Pay 3 Life: Draw 2 Cards
{2}{b}{r},{t} Sacrifice a creature: Return target
creature card that has been placed in your
graveyard this turn onto the battlefield.
"All deals are open to last instant renegotiation.."
- Standard Infernal Contract Clause.