"To pass through the jungle: silence, courtesy, ferocity, as the occasion demands."
—Kamau, "Proper Passage"

Classic Sixth Edition

Unseen Walker

Forestwalk (This creature is unblockable if defending player controls a forest.)
o1o
Goo
G Target creature gains forestwalk until end of turn.

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

Mirage

Forestwalk (If defending player controls any forests, this creature is unblockable.)
o1o
Goo
G Target creature gains forestwalk until end of turn.