Authorize

[Machinus]

Authorize

Instant
The next artifact or enchantment spell you play this turn can't be countered by spells or abilities.
Draw a card.

[Ephraim]

Approved.  White isn't an anti-blue colour, but its appeal to greater authority makes this spell very plausible.

[Matt]

We already made this card; in fact we completed the entire cycle. From the master list:

Burden

Sorcery
The next spell you play this turn can't be countered by spells or abilities. Draw a card. Lose 2 life.

Mandate

Sorcery
The next enchantment or artifact spell you play this turn can't be countered by spells or abilities. Draw a card.

Finalize

Instant
The next instant spell you play this turn can't be countered by spells or abilities.