sorry just added carrion feeder to the mix
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not sure ... me and my friend thought of it randomly then i made sure to do my research before i posted anything O.o ... next will be the persist modular combo that I "believe" might work?
... you get to choose what order persist or undying go on the stack and as soon as one resolves the card is no longer in the graveyard and the other ability won't trigger / also now +1/+1 counters and -1/-1 counters cancel out as a state based action ... :P
creature dies, lets choose undying to trigger, comes back with a +1/+1, creature dies, undying won't trigger but persist can bringing it back with a -1/-1, creature dies, persist can't trigger but undying can ... etc.
Still working on a color code / some creatures, advice appreciated
heheh never saw it before, pretty awesome though only drawback would be against blue decks / finding the blue mana unless i have tolarian out