Moondog's Grove

When Moondog's Grove comes into play, attach
it to target land you control.
When enchanted land is tapped for mana,
surveil (1), then draw a card.
Tap ({t})enchanted land and Moondog to cast an amount of known spellbook spells equal to
Moondog's toughness minus power for free.
As long as enchanted land and Moondog remain untapped, all known spellbook spells cost {1} less.