"Hmm, cool ability. There's gotta be some commanders that are really gross with that. Let's take a look...activated abilities that cost 3 seem the most powerful..."
"Oh man, sliver overlord must be disgusting, 1 cmc to tutor any sliver? Yikes."
"...wait, activated abilities only, right. That probably cuts down on the number of slivers by quite a bit, but at least there's a few like Magma Sliver and Clot Sliver."
"...wait, let me check the wording of those abilities...oh damn, those aren't activated abilities at all, they're static abilities that give an activated ability, so I can't run those either."
"...so how many slivers CAN I run? It has to have its own activated ability...okay, so it looks like.....4. And one is redundant with overlord. Okay, so zirda is a worthless companion for Overlord."
"....wait, changelings! I can run changelings! Amoeboid Changeling is pretty strong with overlord, but what else could I do with the ability to tutor up changelings for 1 mana?"
And that's how I ended up building this monstrosity - Overlord Zirda Activated Ability Changeling...elf...rebel....zombie....wizard......ally........etc.