Where Bison Dwell

Bestow {1}{w}(If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a land again if it's not attached to a creature.)
{t}: Add {w}.
Enchant creature get +1/+1 and has, "Whenever this creature attacks, tap target creature."
If Where Bison Dwell was an Aura, it has, "{t}: Add {w}, {u}, or {r}."