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By far the best tool for this would be a card like Cathar's Crusade, which puts a +1/+1 counter on each creature whenever another one enters the battlefield under your control, or Katilda, Dawnhart Prime, who lets you put +1/+1 counters on each creature

It's also a solid addition to the 99 of commanders that enjoy slapping faces repeatedly, like pirate commander Admiral Beckett Brass

The Flair is also a badge of honor, since you need more and more of the same card and larger amounts of Shinedust to get the higher-level Flair

Are Holo or Reverse Holo Cards Better for Playing

You can see all of the cards Tio posted on imgur but here are my favorites