It's more of a cantrip than a true card draw spell, since it only draws one card per instance of casting Top, but it also redraws itself pretty easily
I personally find this to be super unengaging, as it usually just gives the best deck at the table the resources to win the game, and the group hug player isnt equipped to stop them
The ability to ramp into additional mana is a very integral part of the Commander format in Magic: The Gathering
Creatures usually need a turn to get going, whereas instant and sorcery effects happen immediately upon resolution
Furthermore, this card can also negate a card the opponent controls by attributing a Crusadia monster that it points to, which makes this card a reliable OTK tool while also having immense utility if the game does not end during the turn that it is summoned
It's technically not a mana rock, but it does wonders for resource management