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Black Belt's Training Supporter

They're something to nudge you toward playing both cards (including cards you might not have included otherwise), many of which hearken back to fun combinations you may have built in the past

Discord, Lord of Disharmony is a Legendary creature chimera card in Magic: the Gathering MTG

Its a decent little role-player, especially since 3 mana usually nets you one or the other

It is particularly potent in decks that care about Enter the Battlefield triggers or copying powerful utility creatures like Dockside Extortionist to generate a burst of mana before the mirror reverts to its reflective state

A common card with the right ability can be worth more than some rares