Hey JonnyG21. Tell me about it! I've put the skites in the acquire board at the mo for people who don't own any and to bring the budget down.

freakingShane. Thanks. Testing those at the moment.

smackjack testing Isochron Scepter at the mo.

Hobbez9186. Trying Rogue's Passage at the mo.

No more Spellskite?

Now that you have Isochron Scepter you might consider splashing white for Silence and Dawn Charm. Getting to cast one of those every turn is fun :). Silence makes sure your opponent wont be able to cast blockers after titi flips..

What is Dimensional Infiltrator for? Just a chump blocker? I would say Dawn Charm or any Unsummon variant would do the job much better..

The only thing I don't like about Rogue's Passage is that it isn't a spell so it doesn't count to remove a counter.

It does also tie up 4 mana which depending on what else you need to cast that turn it can prevent you from being able to cast a counterspell (although your average cmc is super cheap). That doesn't mean take it out since in a longer game that may not matter and you can do it with an empty hand.

Unless you have more than 1 TitI on the board, it's going to take 2-3 attacks to put someone down since you don't really have other aggressive creatures (though you can poke with those flyers). I like the idea of Distortion Strike since it has rebound and adds an extra damage, so that "guarantees" 16 damage for only a single blue mana and leaves your mana pool open for absolutely anything. Artful Dodge is another cheap option that could work too and being able to use flashback whenever you need might work out better than Rebound. I like the idea of Plumeveil in there, too. I think since you only have 14 creatures I'd try moving the Echoing Truth to the sideboard to add in the Plume since there is room over there, and Echoing Truth could be a wasted slot if there aren't targets.

The only other card that I really like for mono blue that can help with your setup is Anticipate. You have a little bit of draw from Serum Visions and the scry 2 is nice, but that's about it to get through your deck. The Delver sort of lets you scry for spells, but Anticipate can straight up save you 3 turns, and since it is an instant you can leave your mana open to play or bluff counter spells and do it at the end of your opponents turn to grab a card that might have otherwise taken you a few turns to get to. My friend that plays his TitI deck has that problem since he only runs 12 creatures where he just has a ton of pump or counter cards and nothing to use them on because he has to get through so many non-creature cards in the deck.

Just some budget suggestions, I don't know exactly how each of those cards are working out for you in playtesting so you would know best what cards to move around. It's nice to have 4 slots open in the sideboard so you can try out different things without having to lose cards altogether.