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Gravecrawler perhaps being the most popular

Narset, Parter of Veils Narset, Parter of Veils This will work well in a Mono-Blue devotion deck that has a build more centered around noncreature permanents like other planeswalkers and enchantments

Notably, if Spark Double copies a Gideon planeswalker that's a creature because its loyalty ability caused it to become a planeswalker creature, Spark Double enters as a noncreature planeswalker and doesn't get a +1/+1 counter

While players might have few rares, they might have several or even many copies of key commons

Name me another mechanic in a single color that's as heavily printed today as Burn