Relentless Rats/ Ravenous Rats - Two similar takes on the growing rat horde
Power Plant Worker will get two +1/+1 counters instead of getting +2/+2 if, at the time the ability resolves, you control at least one creature named Mine Worker and at least one creature named Tower Worker
Discard all energy of all pokemon in play
A simple and effective strategy is to give deathtouch to creatures with first strike, like Danitha Capashen, Paragon and Kellogg, Dangerous Mind, to make them ultra good in combat
Red isnt looking to do that, which bumps Unexpected Request down a grade, but splashing this in a black/white deck or running it when you have some random sacrifice outlets could be very good
Evolving Skies is said to have some of the worst pull-rates, so combine this with super-rare and popular cards, it's no wonder this card is one of the most expensive