Korva, Mutagenic Grower

When Korva, Mutagenic Grower enters the battlefield, each of your lands become 3/3 creature with haste and first strike. they are still lands.
When a land you control is put into the graveyard any where, return it to the battlefield with a +1/+1 counter on it. It has haste and trample.
Korva gets +1/+1 for each land you control.