Sorcery Supreme

Search your library and graveyard for up to X instant and/or sorcery spells and put them into your hand, shuffle your library, then flip a coin. If you win the flip, you may cast play half of those cards without paying their mana costs, rounded down.
Then, shuffle all cards that were played without paying their mana costs, and Supreme Sorcery, back into your library.
"Now, witness what true magic can do." -Harvuk