Dualcaster Mage | Saw in Half

Cards

Dualcaster Mage and
Saw in Half in hand.
There is at least one creature on the battlefield.
({3} magic symbol) ({B} magic symbol) ({R} magic symbol) ({R} magic symbol) available.

Cast
Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , targeting any creature.
Holding priority, cast
Dualcaster Mage by paying ({1} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Dualcaster Mage enters the battlefield, copying
Saw in Half targeting
Dualcaster Mage.
Resolve the copy of
Saw in Half, destroying
Dualcaster Mage and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
Both
Dualcaster Mage tokens enter the battlefield, triggering themselves.
Resolve the first
Dualcaster Mage trigger, copying
Saw in Half targeting a
Dualcaster Mage token.
Repeat from step 4.
Once you have a large amount of
Dualcaster Mage triggers on the stack, you may resolve those triggers, copying
Saw in Half targeting any creature you control to create infinite token copies of the creature(s).
You may also resolve the
Dualcaster Mage triggers, copying any other instant and/or sorcery spells on the stack.