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This includes things like Door of Destinies, Vanquisher's Banner, and Herald's Horn

If you look at a typical Infect deck list all of its creatures are Phyrexians thanks to an errata a while ago, so The Seedcore works as a dual land (this is could also help open up the possibility of more three-color infect builds rather than the two-color builds which are most popular today), and almost all the most popular Infect creatures are 1/1s, which makes The Seedcores corrupted pump ability especially impactful

One of the best synergies in the deck is Cloud, Midgar Mercenary with Buster Sword

But both of those effects on one card is compact and powerful, making the entire Funeral Room // Awakening Hall package quite strong