It's what allows you to turn any discarded creature card into a 4/4 Zombie token
However, Iron Golem has vigilance, so it doesnt tap when attacking
You don't have to choose a target for Hazel's Brewmaster's second ability
While Expressive Iteration technically only replaces itself as far as cards in hand are concerned, it's the perfect spell to drop on turn three in a land-light hand, in order to make your land drop for turn and set yourself up for turn four as well
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So, if your stuff comes back into play at the end step, you can still sacrifice it again, and itll come back at the beginning of the next end step