Wurm Tender

When Wurm Tender enters the battlefield, put
an Egg counter on any number of target forests.
Remove an Egg counter from a land: Create a 1/1
green Wurm token.
Remove 4 Egg counters from lands: Create a 5/5
green Wurm token.
Remove 7 Egg counters from lands: Create a 8/8
green Wurm token.