@Ormarossa I dont know if
Admiral's Order is a good card or not, thats why I want to test it and I have to disagree with your assumption that removal gets played before combat. The only thing which is played against us pre combat is
Cryptic Command. Normally we have our Vial open on 2, therefore the opponents wait until they play something and even without Vial I have almost never seen anyone who plays removal pre combat against Merfolk.
Why do I think Order is good? Like I said our opponents interact with us either in attack step (Coco, Chord,
Flash Creatures) or during blocks (Removal), in those cases Order is very good. In the opponents turn its less good than
Spell Pierce in the early turns because it simply costs 3 mana and even later its harder to leave up 3 mana. Still I believe this deck grinds better with all the new additions and therefore we should hit our land drops more consistently, so 3 mana shouldnt be too much of a problem in this deck. Dont get me wrong
Cancel is not modern playable, but with the upside of costing 1 mana in combat its a consideration and maybe thats enough.
Spell Pierce was a staple in my decks, but it has its disadvantages and I was never really happy to have it in my deck, it was just the best option available.
Heroic Intervention can be an interesting card, but most of the time it will trade 1 for 1 for removal. We dont wanna leave our guys back defensively and use the Indestructable part. Sometimes it could be useful to get two all in attacks in when you need it, but I think thats a real edge case. So I think there are better options for two mana.