Diarsun, The Creation Dragon

Indestructible, Flying, First Strike
Diarsun cannot attack, block, or activate abilities unless five or more charge counters on it
Whenever a nontoken creature enters the battlefield, but a charge counter on Diarsun
Whenever Diarsun attacks, create 4 1/1 green saproling creature tokens
{2}{w}{g}{t}: Populate (Put a token onto the battlefield that is a copy of target token you control)