Dovin Baan is the only pw with which I had any success against Tezzeret, in the Coalition event. I tried my normally effective Ob Nixilus Deck, but it inevitably would run out of steam, or lose to a fully energized board.
Others have different cards, and so use different formulas, but you may be able to adapt this one for your card set.
You will see at least one clearly inferior choice in the mix below…
Creatures:
Gisela the Broken Blade (Lifelink)
Startled Awake (mana)
Spells:
Smite the Monstrous (point kill)
Humble the Brute
Disperse (Against the swarm of token creatures, this is a very cheap kill spell).
Fragmentize
Welcome to the Fold (theft)
Confiscation Coup (theft plus de-energizes gems!)
Talent of the Telepath * Card quality at no loss of mana *
Day's Undoing - huge card draw, plus mana advanatage
Tezeret’s deck and abilities are frighteningly good. He can cheaply create 4-power tokens, that fabricate. He has a creature that gives these tokens hexproof. His mana strength is fierce, his other creatures potent, and he has an endgame with Gonti’s Aether Heart / Dynavolt tower that can end the game a single turn if the board is flooded with energy. … and he has a stupid amount of life. .. so it’s a marathon. About the only thing he doesn;t do well is kill your creatures (He does this too, just not as well).
To beat him I believe you have to be able to neutralize his threats, while ensuring that the board is never so flooded with energy that the endgame above can wipe you out in a turn. For me the key card for this is Confiscation Coup. Besides taking away a threat, it creates one for you, and clears the energy off the board. One nice side effect of fighting him is that he will usually make enough energized gems for you to cast this.
Humble and Smite help you control the board. Disperse does this too – but its goal is always those damned token creatures. He makes so many of these you can never have enough Disperses. You will be using other removal on them as well.
Fragmentize is a little like fighting an uphill battle – stemming the tide against so many supports, but i found it more helpful than another creature.
Gisela’s main value is as a life linker flyer than doesn’t have to block. Even with all this removal, in the games I won, I gained a hundred or (much) more life with her.
Using your life total as a resource almost makes me want to use cards that pump power… Just can’t spare the slot.
But she is mythic, so you may not have access to her. You could try another life linker.
Oh yeah, she also does damage.
But most of your offense will come form stealing his creatures. Not having to face that creature is nice, too.
This actually makes Startled Awake doubly useful. Besides being the best mana burst blue has, it returns to your hand… freeing up a spot to steal a creature.
Oh yes, I have replaced a stolen creature with this multiple times, just so it could return to hand and allow me to steal another one. It’s even better when you get to steal a second copy of a creature, and leave that spot open for the next one.
This may also be Day’s Undoing;s best moment in the sun. You really need to keep refilling your hand. Wrecking any partially filled enemy spells and gaining some mana are nice side benefits, though.
Welcome to the fold is surprisingly useful. After a couple of rounds, you cannot steal the creature in the first slot, due to all the fabricate tokens, but there are at least two others worth stealing… and stealing Baral is pretty amazing.
Since I got nowhere before this formulation, My 60% or so against Tezerret seems pretty good.
Interested to hear how others have managed.
Other card Options I don’t have:
Exert Influence (cheaper than Confiscation Coup - but replace Welcome to the Fold instead - you NEED to periodically de-energize those gems!)
Still, I wish I had this one to replace Welcome.
The Moon card. … sigh. 8 mana isn’t awful to kill a critter, but…
Other card Options I tried
Dynavolt tower
This makes and takes advantage of lots of energized gems – it would inflict lots of damage, but this is not actually a great choice… with around 500 hp, the recurring damage is far less important than keeping the board stable. Every card has to keep Tezzeret off balance, or help keep you alive.
Avacyn - The ability to get your opponent to crash into her or a large creature the turn after she comes out is great, and having a blocker can be worth some great breathing room, but Tezerret’s creatures are often too large to be killed by this… it’s good, but not as good as fragmentize, I think. YMMV.
Silverstrike: The board just gets too busy for this to be reliable.