As an opponent, Myrel, Shield of Argive looks more suspicious, like you have combo's to protect. People might show aggression towards you more, because of that. If you don't actually have combo's to protect, I personally wouldn't want the additional aggression towards me because of it. I think that card makes you look more threatening than an Angel of Jubilation would. I'd rather play the anthem and accidentally annoy very specific opponents than look threatening in ways I'm not. But if you have a lot of soldiers in your deck otherwise, the attack trigger might become a reason to play Myrel.

Have a reason to include cards in your deck for supporting your strategy. That's almost always a better way to build your deck than discussing which card is individually more powerful. The cards need to perform well with the rest of your deck, make sure they fit. And looking scary without a plan to actually be scary is a foolish way to lose.

Good thing baby wipes don't clear the baby.

It shuts down some very poweful stuff like phyrexian mana, Necropotence and Flooded Strand and the other fetchlands like it. The shocklands ( Sacred Foundry ) become mere guildgates. It could be a middle-of-the-road card in bracket 3 decks to punish the players who overbuilt and overoptimised for their bracket in, probably, a mono white deck. Niche corner to perform, but the anthem does help most mono white strategies that would want to play this, so that it's not a dead card when your opponents don't play fetchlands. It both slows your opponents, and speeds up your mono white win. That's far from horrible in commander. If the anthem is not going to help your boardstate much in a multicolor deck, I'd have hesitations to play it though.

It also shuts down Aristocrat strategies. If you hate those with a passion, play this card.

Holy necrothread batman!

Dualcaster Mage goes infinite with Twinflame already, resulting in as many 2/2s with haste as you can think of. Altar of the Brood will just make it so that you don't even need to attack. Season of Growth will make you draw a card from the original Twinflame and scry through your entire deck as every Dualcaster Mage token being created is a creature entering the battlefield. I'm not sure what Pelt Collector is going to do, if it's a 1/1 it becomes a 2/2. None of these things actually go infinite with anything, but most can be a payoff for making infinite-adjacent creature tokens, with the original combo. Which already wins with combat damage in most cases.