Yaheeli, Speaker of Ancients

Eminence- Once per turn, as long as Yaheeli,
Speaker of Ancients is in the commandzone or
on the battlefield, you may pay {3}{w}{g},
Elephants you control get +2/+2 and trample
until the end of turn. Activate this ability only
when you could cast a sorcerey.
Whenever an opponent casts a spell, create
a 3/3 green elephant creature token unless
it's controller pays {1}