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but since each copy can choose its own target and each copy goes on the stack seperately wouldnt it go

--casts tendrils
places copies on stack
loses two life for first copy targeting
gains two...

Wait does the red leyline work against tendrils? to the best of my understanding it doesnt, cuz like the copies all go on the stack, and then each pick a target, leyline deals you 2, then tendrils...