28 cards where the full Oracle text includes “opening hand”

A-Leyline of Resonance (Duskmourn: House of Horror #A-143)
Chancellor of the Annex (New Phyrexia #6)
Chancellor of the Dross (New Phyrexia #54)
Chancellor of the Forge (New Phyrexia #81)
Chancellor of the Spires (New Phyrexia #31)
Chancellor of the Tangle (New Phyrexia #106)
Devourer of Destiny (Modern Horizons 3 #2)
Emissary's Ploy (Conspiracy: Take the Crown #4)
Gemstone Caverns (Time Spiral Remastered #280)
Leyline Axe (Foundations #129)
Leyline of Abundance (Core Set 2020 #179)
Leyline of Anticipation (Commander Legends: Battle for Baldur's Gate #726)
Leyline of Combustion (Core Set 2020 #148)
Leyline of Hope (Duskmourn: House of Horror #18)
Leyline of Lifeforce (Guildpact #90)
Leyline of Lightning (Guildpact #68)
Leyline of Mutation (Duskmourn: House of Horror #188)
Leyline of Punishment (Magic 2011 #148)
Leyline of Resonance (Duskmourn: House of Horror #143)
Leyline of Sanctity (Core Set 2020 #26)
Leyline of Singularity (Guildpact #29)
Leyline of the Guildpact (Murders at Karlov Manor #217)
Leyline of the Meek (Guildpact #10)
Leyline of the Void (Duskmourn: House of Horror #106)
Leyline of Transformation (Duskmourn: House of Horror #63)
Leyline of Vitality (Magic 2011 #183)
Providence (Eldritch Moon #37)
Sphinx of Foresight (Ravnica Allegiance #55)

It is the moment of discovery, the triumph of the mind, and the end of these results.