So hey is nekroz for some draw power limited when stupid coc and harpies get to keep their draw power card. Come on Konami use your brains for once. Why do they hate spellcaster support?
Do you even know why people call certain cards "pot of greed" like effects? Pot of greed net gain is +1 (You use pot -1, you draw 2 so +2, total = +2-1 = +1
Valkyrus: the ritual spell -1, the tribute -1, the card you tribute for the effect -1, the card you get to draw +1, total: -3+1 = -2