Gnomish Hideyhole

{t}, {g/w}: Attach target creature you control to
Gnomish Hideyhole. It gains hexproof until end
of turn. It is now in cover (Creatures in cover
cannot attack or block. Sacrifice it if the land it is
attached to leaves play. Unattach it whenever you
could cast a sorcery for its mana cost).
Costs to cast cards in cover or enter the battlefield
from cover are reduced by {1}