On one side, it helps go-wide decks by handing out +1/+1 counters to creatures that entered that turn, while the flip side, Embrose, Dean of Shadow, offers a more control-oriented engine that buffs your creatures, damages them, and draws cards when they die
They've anchored control decks and powered combo strategies since the creature type debuted
The risk is that early prices can be emotionally inflated before enough supply reaches the market
If you can play "OP06-081 Absalom" or deploy "OP06-098 Thriller Bark" while using cards to lower your opponent's costs, you will be able to maintain your board advantage while using your DON
This means that they can then only tap for Red mana - and if your opponent doesnt even have Red in their deck, it could well win you the game on the spot