Herd of Corgis

As long as an opponent controls 4 or more food
tokens, corgis you control get +2/+2 and gain
trample.
Whenever a player sacrifices a food token,
create a green 2/2 Corgi creature token.
{3}{g}: Target opponent creates a food token.
That token's ability costs {1} to cast for each
corgi you control.