First, I have never played Tiny Leaders and I doubt I’ll ever play it enough to have any real expertise in the format, but on the other hand, I do understand quite a bit about the game, so I can at least brew, even if I don’t really know the meta. This is my first attempt at a deck.
Hapatra is my choice of a commander (or leader) here.
As Mark Rosewater explained in his column today, designing with -1/-1 counters is much more difficult than designing with +1/+1 counters, which means that there just isn’t as many cards that use them, but there’s clearly enough for a deck.
There’s also a bunch of Infect cards that would work here nicely, but I left them out. The problem with the previous list ist that in the context of the format, these are quite expensive. Most of them cost three, so we’ll probably have to cut some of them.
Now, I don’t know if having manadumps is a good idea in this format, but I doubt it, so I’ll cut the Fevered Convulsions. Same with Torture, even though it feels like something I’d want. Cartouche of Ambition is also probably a bit too much. I can’t probably trigger Woodlurker Mimic as often as I’d like, so that’s out as well. I’m not quite sure about splendid agony, but I’ll leave it in. That leaves us with 24 cards + Hapatra. Since I probably want to play 19 lands, that leaves me with room for six cards, which isn’t much.
I would like some card draw here, but I doubt that would be very good in the format, so I’ll just put in a Whispersilk Cloak and five different cheap removal spells.
I wouldn’t mind fitting in a couple of Liliana’s, but there just isn’t room right now.
The mana is pretty awkward, especially if the format is as fast as I imagine it to be, but many of the black cards require double black, so we need quite a few black sources.