mtg cards with populate Trostani Selesnya's Voice Selesnya G/W Commander EDH Deck Pre-Built Yrwen, Grovetender [Populate Planeswalker] :

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For impacting the board at all stages of the game, this card makes an argument to be in the top 10 myr of all time

Green decks can take this further, and there are some legendary matters synergies that might lure greedy drafters towards a four- or five-color build, but this is nowhere near as viable as in, say, Tarkir: Dragonstorm

$1 North Stars suddenly being posted for $10, but their demand profiles are likely to be much stronger, and their gains in terms of real $ and ability to support deeper inventory are likely to be significantly superior

It's both an enabler for mana bases with heavy color requirements, and a payoff/wincon for those decks

Did Steve tell you that, perchance