Getting card draw when creatures die over the course of the game is already great, but its the -1 toughness that really gets this engine running
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Getting a bunch of hasty creature tokens seems ideal, but also being able to use tap abilities right away is going to be good
And maybe even the resurgence of an Amber/Emerald aggro deck on the competitive scene
You'll also need a solid ramp plan if you want your enormous dragons to get off the ground
They arent the explosive, hand filling draw, and they arent rituals or ramp, producing only a temporary mana advantage