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Salvage Titan may be worth including as well, as it will almost always qualify for the alternate casting cost

I have a more detailed explanation of these in the introduction of my Graveyard Overdrive blog

Maybe as a single card reprint

You get to draw an extra card, re-spend all your mana, and get an extra combat stepnot to mention extra upkeep/end step triggers, planeswalker activations, and so on

This is incredibly potent and makes Grist, the Hunger Tide an immediate lightning rod once it hit's, so make sure you're either ready to defend it or content with one activation

Not only that, but Spirits that are targeted by this card also return to the battlefield with an additional counter on them