nihilego pokemon card GX - 49/111 Basic Pokemon Nihilego • Extradimensional Crisis (A3a)

The first time person who ever activated Karn against me was Level 3 Judge Ben McDole, playing it in his Progenitus Superfriends deck

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Erode is another one mana white removal spell that provides a hard answer to a creature

That includes a few of the Arcbound creatures, to include Arcbound Ravager

If you were to have a land type count as that color instead, you would allow Mtenda Lions and such, but disallow many more things

To trigger the Meld mechanic, a player must own and control both cards on the battlefield, and then pay seven mana of any color