The fact that you might not be able to enable it until later in the game, and even then the payoff is very minimal, makes me think this wont make the cut very often
Creature - Soldier Merfolk Color tag templates(None) Zegana, Utopian Speaker When Zegana enters, if you control another creature with a +1/+1 counter on it, draw a card
A few cards that had a big impact on later Green influence should be noted here: The reason I'm noting these is that they all exhibit a huge aspect of modern Green tendencies, though they were mostly isolated effects, rather than cards that were part of a bigger trend
Card Name Mana Cost Type Enchantment Rarity Mythic Rare rules Text If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead
The lifegain won't come up often (unless you're playing a dedicated Town deck) but with Starting Town it's a fun little way to occasionally offset the life loss of the card