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Marchesa and grave betrayal great synergie = opponents creature dies and comes to you with a +1/+1 counter and will be reanimated when they die through Marchesa.Marchesa + undying creatures = creature die -> returns with +1counter, dies again returns without +1counter = undying can trigger again and so on...Marchesa + Hellhole Flailer = sacrifice to deal damage, returns thanks to unleash and Marchesa.Contamination makes opponents lands useless (unless they play black) the upkeep cost is easy to sustain through sacrificing undying creatures.
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