mtg dominaria united most valuable cards Collecting Top Ten Cards from Dominaria

if a player removes the Ouphe, they can use their Treasures again

In exchange for being much easier to cast at 3 mana, you receive a dream counter for each opponent you have instead of a fixed amount, and you have to tap to remove the counters for mana, slowing this iteration down considerably

In other words it is more restrictive than normal RG gold cards which may be played in 8/31 of the colour combinations with this only really working in 3/31

Once you start recurring creatures, your opponents have a steady stream of problems to deal with

You have enough power in your top end to easily win and you have enough reliability in your ramp to get there