Shinies are cards that show versions of Pokemon that you occasionally find in the digital versions of the game, such as Pokemon Go

Abu Ja'far Austere Command Avenge Begin Anew Breaking Point Catastrophe Ceaseless Conflict Citywide Bust Cleansing Nova Damning Verdict Day of Judgment Depopulate Devastation Doomskar Dusk // Dawn Elspeth, Sun's Champion End Hostilities Expel the Interlopers Fated Clash Fated Retribution Fell the Mighty Final Showdown Fumigate Glyph of Reincarnation Harsh Mercy Heat Stroke Kirtar's Wrath Kjeldoran Frostbeast Localized Destruction Mageta the Lion March of Souls Mogg Infestation Nevinyrral's Disk No Witnesses Phyrexian Rebirth Planar Collapse Planewide Disaster Puppet's Verdict Restricted Office // Lecture Hall Retaliate Retribution of the Meek Rout Shatter the Sky Slash the Ranks Solar Tide Spectacular Pileup Starfall Invocation Sublime Exhalation Sunscour Sylvan Basilisk The Battle of Bywater The Night of the Doctor Unstable Glyphbridge Vanquish the Horde Venomous Breath Whiptongue Hydra Whirlwind Winds of Rath Wrath of God

Its red cheeks and outer ear tips will also turn blue when it blinks or is asleep, making it very cute
The most common play pattern with this is to draw three cards immediately after you cast it, but sometimes you need to hold mana for other effects or cast it on turn 5
The goal is to be inconspicuous and steal wins out of nowhere, after all, and a savvy player will sniff that out the second you start handing out free cards and land drops
And do you forsee a new Master Rule change coming up