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These cards represent Chandra at various stages of her life

1 token/ad card, Helper card, or a special card from Magic's historyfound in 25% of packs

It's deck optimization and card search rolled into one ongoing conversation

Cards that draw/add multiple cards, like Professor's Research, will also not cause you to exceed 10 cards, instead only drawing/adding cards up to a full hand (so playing Professor's Research with a full hand, for example, will only draw 1 card instead of 2)

But the third option that puts a +1/+1 counter on every creature is much more potent than the one that just generates a 2/1

The first of these was Dragon Vault, printed in 2012 as part of the Black and White series