{@@HOB C} Beorn's Hospitality [The Hobbit] [HOB 120]

Landfall — Whenever a land you control enters, put a +1/+1 counter on target creature you control.

5GG: This enchantment becomes a Bear creature in addition to its other types and gains “This creature’s power and toughness are each equal to the number of lands you control.” (This effect doesn’t end.)