Whether or not Venerated Rotpriest ends up a four-of in Infect reminds to be seen - usually Im the guy dying to Infect, rather than killing opponents with poison counters, so I'm not an Infect expert by any means, but at a minimum the new one-drop offers enough upside and unique lines that Infect players will try it, and I wouldnt be surprised to see some number of Venerated Rotpriests stick in the deck
Now that is a powerful effect for a negative-one cost cantrip
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This can often act as a one-sided mana doubler alongside basic snow lands or nonbasic snow lands like the duals from Kaldheim, which is an incredible rate at 3 mana
After defeat, it flips into a massive Trampler that pressures life totals immediately