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With its Illustration Rare selling for approximately $25 , its desirable among collectors, even though its standard variant can be found for just $0.14

Sylvan Safekeeper has recently been printed into Modern in Modern Horizons 3 , although this green card has yet to make any waves there (apart from destroying me at prerelease, that is)

You also want to do that while Tergrid is in play to get free permanents

This one's a bit tricky to answer, mostly because we don't know yet know the entirety of Shadows over Innistrad

One last thing: Glyph Keeper probably isn't necessary in the sideboard

Alolan Exeggutor ex 242/191 Loading