In regards to DnD I would have loved this aura to lose some toughness per damage taken to be more in line with the actual spell in the game (and to give it a chance in draft/sealed to be removed by swinging into it rather than having to wait for someone to remove the actual aura or creature)
This first list includes what I believe are the current top performers, though that's subject to change with the impending banlist
Anim Pakal, Thousandth Moon still makes 1/1s, but scales itself up and puts out an absurd amount of creature tokens
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Its not unreasonable to think you might just draw twenty cards, right there, and if your deck contains a very unusual amount of mana, you might not be far from drawing your whole deck (especially if youve got a couple of Dakmor Salvages somewhere in the mix, making it completely deterministic that you mill your deck, fill the battlefield, and set up some graveyard kill)