As long as the player has a card already in play matching the required criteria, then theyre able to play another - usually more powerful - card on top of it for less ink than it would cost to play it otherwise
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Hariyama is classified as a 2-Diamonds card in the Crimson Blaze set
"As many players are aware, the immersive Ho-Oh ex (3-Star) and Lugia ex (3-Star) cards from the Wisdom of Sea and Sky expansion currently feature placeholder illustrations," the game's developer said in a statement posted to social media this morning
As an added bonus, you can use Sunder at your opponent's end of turn, possibly forcing him to discard some cards
Having a card that you essentially must put in your deck, no matter what deck your are playing, is a pretty unhealthy thing for a format, which means Modern is likely better off with Mental Misstep on the banned list