If the second ability is activated during the end step, the token won't be exiled until the following turn's end step
The same goes if you use your opponents commanders to attack them
Now let's finish with counters, since we are in the color of Blue
Repudiate / Replicate One of the good things about split cards is allowing the user to play narrow effects, and fewer cards are narrower than Stifle (Repudiate)
Still, this legendary land from Urzas Destiny with great, naturalistic artwork by Douglas Shuler always good to see a hippo in Magic (or a Phelddagrif for that matter) employs the ability to brilliant effect
They are now a defining part of the Legacy and Vintage formats, in particular for their ability to be found by the various "fetchlands" (for example, Flooded Strand) released many years later