Invert Polarity

Choose target spell or ability with one or more targets. Roll a d20 and add the greatest power among creatures you control.

1—14 | You may choose new targets for that spell or ability.

15+ | You may choose new targets for that spell or ability. Then copy it. You may choose new targets for the copy.

Choose target spell. You get (two energy counters), then you may pay any amount of . Counter that spell unless its controller pays for each paid this way.

If you control a commander, you may cast this spell without paying its mana cost.

You may choose new targets for target spell or ability.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it.

Counter target spell. Its controller loses 3 life and you gain 3 life.

Gain control of target spell that targets only a single permanent or player. Copy it, then reselect the targets at random for the spell and the copy. The new targets can't be you or a permanent you control.