Its nice to see Phyrexian mana return as a flavorful and on-theme mechanic without repeating the mistakes of the mechanic that we saw in New Phyrexia , where we got a handful of ostensibly free spells
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but Twinblaze pointed out that Flame Slash is good against Putrid Leech, and Alfrebaut and some others talked about using Flame Slash to help a beatdown deck get past Wall of Omens, or a Red Deck deal with problem creatures like Rhox War Monk (and any Red mages out there know what a serious problem that 3/4 can be)
Having to pay three life for every creature card you draw adds up very quickly
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Your table should be able to recognize the card quickly and play clean games without constant pauses