If you go first in round 1, look at your line up, look at the opponents line up. check if they have a SOB+SOA, see if your damage on your line up is really bad, like if you have redra, sasha, and danae or something. this would indicate that greem is pretty key fory out to win. If you have a chiara, a mandred and a michael, then throw greem out with 1 pill or something. cause you dont really need that poison to win.
something along those lines. its kind of a hit or miss. i usually just send her out with 4 pills
Greem is either Mid pill, like 28 attack or Really high Pill, like 70 attack.
If you're comboing her with pussycats and other DR's, I've even seen some people go first turn all in, and then combo with a Malicia or something, those possibilities are rare but always watch out for them.