I play 3 Zoodiac Barrage with 2 Instant Fusion to bring out Motorhome on the field much faster, but i don't like Marshalling field in the F.A deck since it's too slow for me
I decided on Enterblathnir because you can make him with Marshalling field, but yes that is also good card you can make and probably one I would play in the future.
I almost threw it in but there aren't enough times that you want to make it, and FA Test Run usually does what you need it to do in terms of spot removal and then some.
The whole FA core is probably about $5. If you want to get everything you need to play it'll probably be another $40 for lower rarity at most. The deck's fairly budget.
I decided against it because the only realistic time you want to make it is when you have Marshalling Field up, but it restricts you to playing Machine-types only for the rest of the turn.
That's not the point- you can't do anything with them. Yes, they each 2k atk, but your opponent doesn't take any battle damage with them and because of Marshalling Field you can't link into anything except Qliphort Genius. If you had an Auto Navigator set up as a level 2 or 1 prior, you can at least use one to synchro into a lvl 8 or 9 machine, but the overwhelming majority of the time you're not going to have a lvl 1 or lvl 2 Auto Nav on board due to the FA field spells.