Enchantments are the hardest type of permanent to remove in limited aside from lands
Benjamin calls themselves a "Grail collector", invoking the mythical treasure that over history has been sought by everyone from the Crusaders to Monty Python, and perhaps in an era defined by pop culture it makes sense to create our own relics, to imbue them with mystical status and value
A 4/4 for three ink, this character has similarly strong stats to Rajah, but it also has a neat ability, Mysterious Advantage
That's a lot of power over time, and there is no mana or other costs involved save for the initial six needed for this enchantment
Rattleclaw Mystic also can be morphed, and adds one of each color when flipped up, which could be used to draw out a removal spell if your opponent is nervous about what you might have facedown on your battlefield
If those two would be the only two monsters on the field, then one player would go for a direct attack after this card is played