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i thought about experiment kraj.
for those who don't know it copies all activated abilities from creatures with +1/+1 counters.
i think guildmage abilites don't contribute right cuz you can pay mana to their abilities so are the "sacrifice xyz" abilities.
what remains are abilities that cause to tap.
that is where kiki-jiki comes to mind since you simply untap kraj with simic ragworm or vigean craftmage.
what deck would make a home for this combo???
is there a better card than the mirrorbreaker???

i know! that's why i wrote this!
imagine a guildmage with a +1/+1 counter. it doesn't matter if you activate his ability or the one kraj copied! you understand you'll pay the same amount of mana and get the same effect.
that's similar to sac abs..... of course you could sac kraj but .....
tapping in the activation cost means you can get a effect you would get usually once twice per turn.
understood now???

btw there's synsergy with golgari grave troll.........

Kraj is too expensive to be broken.
Or put in a serious tournament deck.
But for casaul he is fun.
For multi he is hill-hair-ious.
For untap put him with Ragworm.
Get a Niv-mizzet out for a bunch of fun.
I agree it's not for serious play but I've used in casual play and loved all the u...Stuff i could get uo to with it

OR put a +1/+1 counter on an opponents creature and steal its ability! but with simic ragworm you've given Exp Kraj the ability "U, untap simic ragworm." a better if slightly more expensive is Vigean Graftmage 1U, untap target creature with a +1/+1 counter on it.