Monument of the Arcane Giant

Whenever this creature enters the battlefield,
you may cast target instant or sorcery from target
graveyard with converted mana cost 2 or less,
without paying its mana cost.
If that spell targets a Giant creature that you
control, you may cast a copy of that spell an
additional time without paying its mana cost.
Magic whirs and magic stifles; But ideas blurred are somehow trifled.