Start the invasion

Destroy all defending creatures, for each creature
destroyed this way, it's controller creates a X/X
colorless Phyrexian artifact creature token, where
X is the lowest life total among all players.
Exile all tokens at the end of your next turn.
"You may win this battle, but you won't last long"
"Incredible, you must be compleated, come my beasts!"
—Borith versus Norn's Beast Caller