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Card advantage and open mana on the same turn gives control decks exactly what they want

Alaundo the Seer Atla Palani, Nest Tender Brallin, Skyshark Rider Bugenhagen, Wise Elder Chandra, Fire of Kaladesh Gavi, Nest Warden Ghired, Conclave Exile Ghired, Mirror of the Wilds Judith, Carnage Connoisseur Judith, the Scourge Diva Juri, Master of the Revue Kaervek the Merciless Kumano, Master Yamabushi Lagomos, Hand of Hatred Meren of Clan Nel Toth Neera, Wild Mage Rakka Mar Reki, the History of Kamigawa Rydia, Summoner of Mist Sarkhan, Soul Aflame Subira, Tulzidi Caravanner Sunastian Falconer Tasigur, the Golden Fang Valduk, Keeper of the Flame Zaffai, Thunder Conductor

You can have up to 250 tokens on the battlefield at one time

However, it can be a hard one to get a hold of for that exact same reason

What if it was free, though

This ability and Greninjas other strengths make it a very powerful card in any water-type deck