The Paradox Heart

Instant and sorcery spells you cast cost {1} less.
{t} Add one mana of any colour
{4}{t} Add {w}{u}{b}{r}{g} to your mana pool
{6}{t} Roll a D6. This ability has the indicated effect:
1 — Do nothing
2 — Transform target permanent.
3 — Destroy target permanent you control
4 {line} Tutor a card from your deck.
5 {line} Play a creature from target opponents deck.
6 {line} Exile a random spell from your graveyard.
You may cast it for free.