Magus of the Crossroads G
Creature - Human Wizard
All creatures have haste.
I figured since Concordant Crossroads hasn't been reprinted due to being a World Enchantment even though it isn't a Reserve List card that a Magus version of this card might suffice. Green doesn't have a whole lot of cards that grant haste aside from colorless sources like Crashing Drawbridge and Akroma's Memorial to name a few in terms of deck building in EDH / Commander.
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Between this and the Acornmancer from awhile ago, it seems that you like your power level pretty high. I do not think that we've seen a 2 power + haste for 1 mana without 100%puredrawback. Giving opponent cards haste is a real drawback but it seems like something that is just as likely (if not more likely) to purely benefit you.
If Wizards was to rip the color pie a new one and create a card like this in a set like modern horizons, I would expect it to have very conservative states (like maybe a 1/1 or even a 0/1) especially as being a creature means that you can green sun's zenith everything having haste from your library for 2 mana. I would follow that pattern of conservative stats in the future for any future "let's reprint reserved list cards attached to creatures" designs.
I agree, 1/1 would be plenty powerful for this, as when your opponent meaningfully benefits from the ability, you can still board it out (or the other way, board it in when your opponent doesn't). I could see it being 1/2 maybe, but 2 power, not really, especially since haste is hardly represented in green nowadays (I mean, the most recent Gruul had it, but all their cards I remember were red)
It could be a 2/2 for only G if the ability says all other creatures have haste. Still functionally the same card as the crossroads and magus combined. Crossroads never gave itself haste except under very situational circumstances.