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While Stoneforge Mystic is a bit of a pipe dream, adding one or two cards like Shadowspear, Sword of the Animist, Puresteel Paladin, Steelshapers Gift, Darksteel Plate or Conquerors Flail shouldnt have been too much of an issue

I often avoid casting them in spots where two removal spells would take me off of metalcraft and then kill Champion or Ill skip Nexus attacks for the instant speed activations in those two removal spots as long as Im getting somewhere with that turn

If Giant Rex is banished, it can special summon itself, which is useful for extending combos, as it is hard to negate this effect for being used because it is used while the card is banished

Here are some of the best O-Ring alternatives so far: Grasp of Fate, Touch of Spirit Realm, Seal from Existence, Banishing Light, On Thin Ice, Borrowed Time, Act of Authority or Ossification