mtg heart of the cards lorwyn brigid, clachans search your library for up to two creature cards and put those creatures onto the battlefield Glass-Cast Heart - The Lost

The other keywords are nice, but Hexproof is where its at

If the copied creature is a token, the new token that's created copies the original characteristics of that token as stated by the effect that created that token

Aragorn is a bit of a machine and can cause your deck to snowball in power quite quickly

The fact that Lumbering Falls has hexproof means that you can comfortably plan on it doing exactly what you need it to do, when you need it to do so

The copy remembers any decisions that were made for the original spell as it was cast, including values chosen for X in its mana cost and whether any alternative or additional costs were chosen