Currently, the only cards that can bring Ancient Warriors history from the Deck are Ancient Warriors Oath - Double Dragon Lords, Ancient Warriors - Savage Don Ying, Ancient Warriors Saga - Borrowing of Arrowsand this card
The fact that this one has flash is a good upgrade so you can surprise your opponents during a battle and profit
The attacking Creature is still considered to be blocked
Reclamation Sage is a classic ETB Naturalize effect to get rid of enchantments or destroy artifacts, and has the elf subtype, which can be relevant in elf typal decks going forward, or even in the sideboard of green decks in general
And as far as Pokmon TCG bundles go, this is one of the more unique ones
[All Turns] When this Digimon would be deleted, you may prevent it by trashing 2 level 5 Digimon cards in this Digimon's digivolution cards