Elvish Champion

Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

Nature's Cloak

Green creatures you control gain forestwalk until end of turn. (They can't be blocked as long as defending player controls a Forest.)

Dryad's Favor

Enchant creature
Enchanted creature has forestwalk. (It can't be blocked as long as defending player controls a Forest.)

Yavimaya, Cradle of Growth

Each land is a Forest in addition to its other land types.

Eladamri, Lord of Leaves

Other Elf creatures have forestwalk. (They can't be blocked as long as defending player controls a Forest.)
Other Elves have shroud. (They can't be the targets of spells or abilities.)

Hidden Path

Green creatures have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

Weatherseed Elf

{T}: Target creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Ivy Dancer

Lumbering Satyr

All creatures have forestwalk. (They can't be blocked as long as defending player controls a Forest.)