It is exceptional against many combo decks stopping them going off outright and will tend to get in a few extra pings against most decks however it is ultimately just a 3/4 in most situations, particularly with the decline of combo
If that player does, they reveal cards from the top of that library until a card named Mirror-Mad Phantasm is revealed
Heliod, the Radiant Dawn There are Azorius midrange piles helmed by Heliod, the Radiant Dawn that call themselves cEDH, which is cool for them, but this feels like a powerful regular Commander deck to me
Louisoix's Sacrifice is a strong sideboard card though, so bear that in mind
Scourge of the Throne, meanwhile, is best used in dedicated Dragon tribal decks where it can benefit from cost-reduction effects or tribal synergy, and the extra combat steps and +1/+1 counters from the Dethrone ability are merely bonuses that push strong Dragon decks over the top