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PS Platinum Secret Rare QCSE Quarter Century Secret Rare Macro Cosmos X TRAP Continuous When this card is activated: You can Special Summon 1 "Helios - The Primordial Sun" from your hand or Deck

Swordsman From A Distant Land is a great example of this

I think Triskelion is a better card with your Commander than Walking Ballista, but both can go infinite with Mikaeus iirc, but you'll need an extra piece with Walking Ballista because Mikaeus makes it a 1/1 base creature, so it won't die because it has no counters, Triskelion can ping itself and still have a ping for something else, meaning you can combo off easier with it, so I'd go with that

Between the recent bans and the release of MTG Avatar, Standard is going through a renaissance right now