Storm of Crows

Destroy target non-land permanent you don't
control with a converted mana cost less than
or equal to the number of instants and sorceries
in your graveyard, then that permanents owner
creates two 1/2 blue Bird creature tokens with
flying.
Experiment note #103 - Target elimination successful. Unknown factor: Elimination of target causes sudden outburst of beast from another dimension. Investigate further.