While having the flexibility to draw cards impulsively is nice, this isn't true card draw, and you are limited to playing them that turn
There are some hoops involved in melding this in the first place, but thankfully Urza, Lord Protector and The Mightstone and Weakstone are both fine cards on their own
Additionally, whenever one or more creature cards leave your graveyard, you receive a 0/1 green Plant creature token and get to place a +1/+1 counter on each Plant you control
Also, combining with Deathtouch makes it more challenging for the opponent to block effectively
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