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This would especially make sense the longer we follow Kellen through the Omenpaths, as it would point out where the local Omenpaths lead

Most alt-win conditions in Magic have a timing restriction where you need to wait until your next upkeep to win the game, which entering the battlefield tapped more or less did for Maze's End

Muldrotha Example

Its a souvenir of an achievement

Genestealer Patriarch can use its Genestealers Kiss to mark opposing creatures and then make copies of them as Children of the Cult when they die

Gotta collect em all Pokmon Trading Card Game Pocket essentially looks to capture the full experience of the Pokmon trading card game and stuff it into a mobile app