Geralf plays into Thunder Junctions new Plot mechanic, timing your casts for a big burst that summons a horde of undead Token Creatures, ready to tear your opponents apart
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It doesnt matter in the scenarios where youre going to combo off, but I cant think of many combos where an expensive artifact that just prevents damage is going to be an efficient, effective part
You could have just had more than one in your deck, or you could splash some blue mana to cast Vesuvan Doppelganger
Technically, it kills Walking Ballista in Standard and does hate on random energy cards that still show up in the format (like Glint-Sleeve Siphoner) while also doing weird, fringe things like taking explore counters off Jadelight Ranger or Verdurous Gearhulk counters off whatever creature they are dumped on, but this might not be enough to make most decks play a 1/4
The nice thing about Port is the ongoing options it provides