So if you pissed off the Counter Force/Gaia/the Planet, what kind of forces would you expect to have to deal with anyway?
And on that note, what would cause them to get pissed at you in the first place?
To basically state it pointblank.
The Counter Force is basically a hodge-podge of 2 different sources that can sometimes run counter to themselves:
The Will of Gaia and The Will of Humanity(It's really easy to mess this up as usually in the Fate side, we see the Will of Humanity happen more often than the Will of Gaia which is more on Tsukihime's side).
Pissing off the Will of Humanity or getting on it's bad side will usually start deluging you with Servants/Counter Guardians or if you are a really major threat, Grand Servants. Counter Guardians are usually who are picked first and foremost and are actually sent if you become a danger to Humanity in any shape or form(To put it simply, EMIYA is a Counter Guardian and has been constantly sent to basically murder anyone and has been doing so and will do so eternally and there are many, MANY more like him). Servants are primarily sent next if it's a big dick threat like we see in FGO(Although it don't need to be that massive, just enough of a threat that Humanity really can be wiped out and it needs something bigger). And finally, you have Grand Servants who are explicitly meant to fight Beasts(Though they can be used for other things but they will void their Status if they actually team up with anyone as that's not what they are meant to do).
The Will of Gaia, meanwhile, doesn't actually activate when Humanity is threatened but when the Planet itself is threatened(i.e. Aliens as no being born on the Planet of their origin can threaten their Planet... this is what Da Vinci and Holmes meant people) in any way. While it COULD summon Servants, it doesn't actually do that... in fact, it would go much, MUCH deeper and actually summon Nature Spirits(Either at the level or just below a Divine Spirit usually, FYI EDIT: Whoops, fucked that up, they are actually STRONGER than Divine Spirits usually due to primarily using energy from the Planet itself), Phantasmals and True Ancestors. Arcueid is actually a part of this category as while she's more of a TYPE-Moon creation, Earth snatched her up as it's attempt of TYPE-Earth as it cannot create one yet). And then there's Fou which is in fact a creature meant to also cull Mankind because even though Humans can't kill Gaia, it still perceives them as a threat and wants to know whose in charge.
So basically put it like this:
Threaten Humanity and you'll have a deluge of Counter Guardians, Servants and Grand Servants on your ass.
Threaten the Planet and you are going to get Arcuied and beings similar to Primate Murder to get you... or hilariously enough, get someone to grab Excalibur and murk you to Kingdom Come(As the Planet literally had the Fairies create Excalibur to deal with Sefar's bullshit and it's THE Planetary weapon to do so)