You don't even need to target just your own things, turning this into a rather handy politicking tool as well
The cards were given away as promos with particular products, or to anyone who spent more than 1,000 ($6.65) at Pokmon Centers or Stores, up to a maximum of ten total

Gallery and List of Myriad Cards Cards with Myriad: Auton Soldier Banshee of the Dread Choir Battle Angels of Tyr Broodbirth Viper Caller of the Pack Chittering Dispatcher Conclave Evangelist Cybermen Squadron Dalek Squadron Elturel Survivors Genasi Enforcers Gnoll War Band Goldlust Triad Hammers of Moradin Herald of the Host Polygofy Scion of Calamity Scurry of Squirrels Sumala Rumblers Tabaxi Toucaneers The Master, Multiplied Tiamat's Fanatics Warchief Giant Wizards of Thay Wyrm's Crossing Patrol Cards That Grant Myriad to Other Cards Auton Soldier Blade of Selves Corporeal Projection Cybermen Squadron Duke Ulder Ravengard Firbolg Flutist Ironwill Forger Legion Loyalty Mass of Mysteries Notable Myriad Cards Blade of Selves Equipping a creature and giving it myriad is a very nice effect, and it combos with a lot of different stuff
Most people hit the same wall
Choose from preconstructed decks or build your own, play against opponents from around the world, or challenge the AI
Rain of Filth isnt for cowards as it requires you to go all-in to extract the most value from it, but it offers a significant mana advantage to get you there