Fractured Identity | Gather Specimens | Dualcaster Mage

Cards

({7} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) ({R} magic symbol) ({W} magic symbol) available.

Cast
Gather Specimens by paying ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing all creatures that would be created under an opponent's control this turn to be created under you control instead.
Cast
Fractured Identity by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) , targeting any permanent.
Holding priority, cast
Dualcaster Mage by paying ({1} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Dualcaster Mage enters the battlefield, creating a copy of
Fractured Identity, targeting
Dualcaster Mage.
Resolve the copy of
Fractured Identity, exiling
Dualcaster Mage and creating a copy of
Dualcaster Mage for each opponent you have.
The
Dualcaster Mage token(s) enter the battlefield, creating a copy of
Fractured Identity targeting
Dualcaster Mage, and any other instants and/or sorceries on the stack.
Repeat from step 5.
You may also have the additional triggers target permanents your opponent control to exile them and create token copies of them.