That deck also probably wouldnt exist if not for Songs of the Damned, so the card deserves a spot on this list for that reason alone
While the other painlands certainly have their uses, it seems that Llanowar Wastes taking the top spot is due to its popularity in the fan-created Premodern format, and, in particular, the longtime favorite Recurring-Survival deck (which employs the classic combination of Recurring Nightmare and Survival of the Fittest)
But I still think Akroma's Will deserves the top slot because its effectively a modal spell: Its a protection card and a finisher since it effectively makes your board unblockable and gives it double strike
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The idea is that by putting all the Grim Haruspex effects together, you should discover plenty of cards you werent aware of for your decks, especially considering singleton formats like EDH which benefit from redundancy
Cast Hermit Druid and activate it The Hermit Druid method takes just five mana after Survival, while the backup plan takes eight