Requires

Dualcaster Mage must be in hand. Saw in Half must be in hand. There is at least one creature on the battlefield. Mana needed:

Steps

1. Cast Saw in Half by paying , targeting any creature.
2. Holding priority, cast Dualcaster Mage by paying .
3. Dualcaster Mage enters the battlefield, copying Saw in Half targeting Dualcaster Mage.
4. 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.
5. Both Dualcaster Mage tokens enter the battlefield, triggering themselves.
6. Resolve the first Dualcaster Mage trigger, copying Saw in Half targeting a Dualcaster Mage token.
7. Repeat from step 4.
8. 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).
9. You may also resolve the Dualcaster Mage triggers, copying any other instant and/or sorcery spells on the stack.

Results