Font of Magic

X: As a bonus action on your turn, you can expend one spell slot and gain a number of sorcery points equal to the slot's level.
-X: You can transform unexpended sorcery points into one spell slot as a bonus action on your turn. 1st-2 2nd-3 3rd-5 4th-6 5th-7
0: Metamagic - Careful Spell, Quickened Spell