One of the cards leaked in Dominaria Release Notes was this:
Tetsuko Umezawa, Fugitive
Legendary Creature — Human Rogue
Creatures you control with power or toughness 1 or less can’t be blocked.
According to lore, Toshiro Umezawa was able to move from plane to plane, so I’m guessing this is his progeny. There’s another one in Legends as well.
No, I’m not kidding. This guy is Toshiro Umezawa’s descendant.
Anyhow, you know what works remarkably well with Tetsuko? How about this:
So, we’ll start with that. What else? How about all the creatures that do something when they hit the opponent and have the prerequisite stats? There’s plenty of those.
I guess the unblockability enables even more ninjas as well:
Well, that’s all ninjas available in monoblue.
Let’s see what else we can find.
That should be fun, right?
Other things to enable gaining advantage from our creatures:
Not sure we want to play all these, but these are something we’d be definitely interested in.
We have some discard in the deck, so I’ll throw in this Madness card:
We need more creatures and we need ways to stay alive. So, first creatures that gain the ability from Tetsuko, which have other utility.
That would be 51 cards. Now, I’m probably going to cut a few, but this is a good starting point. Now, we need some utility spells. A few counters and some mass bounce should suffice. This deck should be able to dig fast enough to find something when you need it.
This leaves us with room for 38 Islands. Of course, you could put in a few utility lands, such as Strip Mine and you probably should, because the mana is pretty well fixed. However, since you often might want to cast multiple spells on one turn, don’t go overboard with them. I would only play maybe 4 or 5 of those, since there will be situations, where you want to play out quite a few spells on the same turn.