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Then, until the end of your opponent's turn, 1 of your opponent's Digimon gains "[Start of Your Main Phase] This Digimon attacks." Card Text 2 [Security Effect] [Security] De-Digivolve 3 1 of your opponent's Digimon

Both apply continuous advantages to the players who has them, both apply to one and only one player, and both have very narrow interaction with other cards, only ones that explicitly mention them

The reminder text is the important part, which is that no damage is dealt in that challenge. Willpower totals do not protect the target, because there is no damage to soak

Some rare-rarity cards only exist in reverse-holo and holo versions, others only exist in standard and reverse-holo

Just by being played, the card prevented a player's opponent from casting spells at Instant-speed, forcing them to only play during their turn and shutting down a huge number of playstyles