Dualcaster Mage | Three Steps Ahead

Cards

({4} magic symbol) ({U} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Cast
Three Steps Ahead by paying ({U} magic symbol) plus an additional ({3} magic symbol) to select its second mode, targeting a creature you control.
Holding priority, cast
Dualcaster Mage by paying ({1} magic symbol) ({R} magic symbol) ({R} magic symbol) .
When
Dualcaster Mage enters the battlefield, it triggers, copying
Three Steps Ahead, targeting
Dualcaster Mage.
Resolve the copy of
Three Steps Ahead, creating a token copy of
Dualcaster Mage.
Repeat from step 3.

If desired, you can spend an additional ({2} magic symbol) while casting
Three Steps Ahead to add its third mode, allowing you to draw your library and then discard half that many cards.