20 cards where the block is “chk” and the cards flip

Akki Lavarunner // Tok-Tok, Volcano Born (Champions of Kamigawa #153)
Budoka Gardener // Dokai, Weaver of Life (Champions of Kamigawa #202)
Budoka Pupil // Ichiga, Who Topples Oaks (Betrayers of Kamigawa #122)
Bushi Tenderfoot // Kenzo the Hardhearted (Champions of Kamigawa #2)
Callow Jushi // Jaraku the Interloper (Betrayers of Kamigawa #31)
Cunning Bandit // Azamuki, Treachery Incarnate (Betrayers of Kamigawa #99)
Erayo, Soratami Ascendant // Erayo's Essence (Saviors of Kamigawa #35)
Faithful Squire // Kaiso, Memory of Loyalty (Betrayers of Kamigawa #3)
Hired Muscle // Scarmaker (Betrayers of Kamigawa #69)
Homura, Human Ascendant // Homura's Essence (Saviors of Kamigawa #103)
Initiate of Blood // Goka the Unjust (Champions of Kamigawa #173)
Jushi Apprentice // Tomoya the Revealer (Champions of Kamigawa #70)
Kitsune Mystic // Autumn-Tail, Kitsune Sage (Champions of Kamigawa #28)
Kuon, Ogre Ascendant // Kuon's Essence (Saviors of Kamigawa #78)
Nezumi Graverobber // Nighteyes the Desecrator (Champions of Kamigawa #129)
Nezumi Shortfang // Stabwhisker the Odious (Champions of Kamigawa #131)
Orochi Eggwatcher // Shidako, Broodmistress (Champions of Kamigawa #233)
Rune-Tail, Kitsune Ascendant // Rune-Tail's Essence (Saviors of Kamigawa #27)
Sasaya, Orochi Ascendant // Sasaya's Essence (Saviors of Kamigawa #145)
Student of Elements // Tobita, Master of Winds (Champions of Kamigawa #93)

In the blink of an eye, they strode from deep snow to the end of this search.