Dovescape

({W/U} can be paid with either {W} or {U}.)
Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.

Secret Lair Drop

RNA Guild Kit

Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's converted mana cost.

Dissension

({WU} can be paid with either {W} or {U}.)
Whenever a player plays a noncreature spell, counter that spell. That player puts X 1/1 white and blue Bird creature tokens with flying into play, where X is the spell's converted mana cost.

If a split card is cast, Dovescape makes tokens equal to the mana value of the half that was cast.

The Bird tokens are created even if the spell isn't countered by Dovescape's ability. This may happen because the spell can't be countered, because it's already been countered, or because it's otherwise been removed from the stack by the time Dovescape's ability resolves.