Oh... Crap...

[Deathseide]

Want to make your opponant drop gold bricks?

Having a {fervor} in play and a {dual nature}, drop an {elvish piper}, create a token of it with the nature, then use those two pipers to simultaneously drop both halves of the  {B.F.M. (Big Furry Monster Left)},  {B.F.M. (Big Furry Monster Right)}.
The Nature will copy them, and since neither are legendary, you now have 2 99/99 creatures in play that can attack this turn...

Or pull a B.F.M cannon with a couple {rite of consumption}... Just make sure to use the token biggie first...

[particle]

the {elvish piper}s abilities will each be placed on the stacked separately. i dont think one big furry monster side can etb without the other, but unhinged is super jank so who knows.

[DimirOverlord1300]

Once the stack begins can another ability be placed on the stack before it is finished?

[particle]

yes, but because B.F.M. says he cant etb without the other half, one ability won't put them both out.

[Deathseide]

Then solve the problem by alternating with a {quicksilver amulet} or {Deathrender} with a self sac critter on it....
Hope those work...
Either that or use a {channel}, cycle 19 life, having the {dual nature} and {fervor} still in play, and use a {rite of consumption} to regain that life lost in spades, using the token b.f.m

[particle]

i don't think{quicksilver amulet} or {deathrender} work because they still only bring out one side at a time.

[Deathseide]

Hmm..... (Plots evil and nasty surprises for card playing friends) that definitely works...

[Deathseide]

Indeed, just like many other cards,