Why not "all creatures have haste"?

For clarity purposes mainly. If I went with "all have haste" then I would have included a reminder text with "Including those your opponents control."

This convention would IMO also be the 'fix' for shroud if it's ever to make a return. Ie. "This [permanent] can't be the target of spells or abilities you or your opponents control" or even just "This [permanent] can't be targeted by you or your opponents."

You're making 2HG players very unhappy then. Better off including the reminder text

For what it's worth, Mass Hysteria doesn't have the reminder text. It does come from 2003, admittedly.

­Reflex Sliver also doesn't. But, you know. It's a sliver.

Tried to do a Gatherer search for any other keyword that "+all +creatures (or)have (or)gain -control" in Modern. But all I got was Mass Hysteria, a pile of Slivers, Clash of Realities, Magus of the Tabernacle and Rolling Stones. All rather poor examples.

I don't really care for 2HG support, but this card admittedly seems like one that should really work for that format. So I updated the card.

The reminder text doesn't have any precedent (nor does "you or your opponents control) as far as WotC is concerned. That's why I said "I would have included" and also brought up how I think shroud reminder text should be updated for the post-hexproof era since it's something I think these should have. Instead of WotC has opted out of using them entirely and generally only goes for cards that positively affect your own creatures. However, the idea here with this being an efreet is that it has a drawback inherit in its 'granted wish' (though it's not a djinn).