The Redd

As an additional cost to cast The Redd, sacrifice any number of creatures. Create a 1/1 colorless Reddling creature token for each nontoken creature sacrificed this way.
The Redd gets +1/+1 for each Reddling creature token you control.
Whenever a nontoken creature you control dies, Populate. (Create a token that's a copy of a creature token you control.)