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The answer here is two specific creatures: Gixian Puppeteer and Gurgling Anointer, both of which are solid payoffs for drawing our second card of each turn
Not content just to give you value in that way, Zinnia also gets boosted by +X/+0, where X is the number of creatures with base power 1
Wizards of the Coast wasn't expecting Magic to be as popular as it was and were struggling to keep up with the demand
This one gives a creature +X/+0 whenever you cast a noncreature spell, where X is that spells mana cost