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Synergy with strong cards = strong

There are plenty of tools available to make it easy

While MTG Arena is fun and very fast, it didn't really appeal to me as a collector

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

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