His card perfectly captures this
Whenever Sazh Katzroy attacks, put a +1/+1 counter on target creature, then double the number of +1/+1 counters on that creature

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It also allowed for some cool interactions because the card stays the copy of the card for the duration of the turn, so you can interact with it as the Standard card in various zones
Shire Scarecrow | Illustration by Alexander Mokhov Not every creature type shows up equally
Recursion is much more powerful in singleton formats than ones allowing four copies of things and when it comes on the back of a guy that can trade or do other stuff it starts to become very appealing and abusable