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This deck will make lots of copies of Lullmage Mentor out. Once you have seven copies out, when you counter a spell, seven merfolk are made, seven merfolk which are glad to counter the next spell. Once you've made enough merfolk, swarm them. i think this deck could be better, so help would be greatly appreciated.
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Add a few more merfolk (Judge of Currents and Stonybrook Schoolmaster) so that you rely less on copying Lullmage. Then I'd add Intruder Alarm.
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Followed Footsteps is also a good option.
Thanks for your advice RoughneckBarbarian. Does this look better to you? Drowner of Secrets+Stonybrook Schoolmaster+Intruder Alarm is another win condition.
you could also put in a traumatize which does the same thing as Drowner of Secrets.
when you have out a stonybrook and lullmage and a intruder alarm, you can tap lullmage for the first part of the counter, tapping produces a merfolk, intruder alarm untaps stonybrook. rinse and repeat, your enemy never gets to play a spell again.