My offensive PvP team that I have been playing for a few months now. Getting bored with it but having trouble finding anything faster and reliable.
Soothsayer
Behemoth
Valkyrie
Queen Mab
All fully traited
This team can normally destroy any team in about 4 casts of Behemoth and/or Queen Mab. There is a definite chance for first turn kills though more often it will be turn 2-4 when it finishes off the opponent. The trickiest part is getting use to Soothsayer. He is almost always cast first turn after all 4+ matches are taken. Cast him to create a 4 match, or take as much red and yellow as possible, ideally casting him would create a 3 match of red or yellow. He is important for correcting bad boards and provides the most consistency in ensuring fast games. Tried modifying team with Mercy instead but found her to be less consistent.
Queen Mab should never be cast unless you have 13 Blues+ or it is the killing blow. Behemoth often does majority of the damage getting through impervious troops while being a great tank. It is often best to leave skulls for your opponent as Soothsayer is sacrificial after his first cast and Behemoth can often tank further skull hits thanks to his third trait. With Valkyrie removing colours from the board, you will be surprised with the number of extra turn cascades you will get from Soothsayer and Behemoth. Always cast Behemoth when he is full unless Queen Mab can be cast for an extra turn.
One final thing of note, work on getting all magic kingdoms to level 10 and 5 starred as this is what turns Behemoth into an unstoppable killing machine.