You need to have a way to get rid of it, unless you want to control it and nothing else for the remainder of the game
The back face is the more usable side of the card and features the card's proper text stylized as the cereal box's nutrition information
Anyway, they read, If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead. Its powerful, but its also on a Creature, which can make it a little too easy to remove if you ask us

Academic Dispute Accelerate Acrobatic Maneuver Afflict Aggressive Urge Aleatory Aphotic Wisps Arcane Subtraction Arrester's Admonition Aura Finesse Auspicious Arrival Backslide Bandage Befuddle Bewilder Bladebrand Blindblast Blur Boiling Blood Bone Harvest Bone to Ash Broadside Barrage Carom Cerulean Wisps Chain Assassination Chaotic Strike Charge Through Chill of the Grave Chilling Trap Choking Tethers Code of Constraint Compleat Devotion Confront the Unknown Constricting Tendrils Consumed by Greed Courageous Resolve Crimson Wisps Crippling Chill Cunning Maneuver Cunning Strike Dark Dabbling Darkblast Death Pulse Decoy Gambit Decree of Savagery Deem Worthy Defiant Strike Deny Entry Depose // Deploy Depower Djeru's Resolve Dual-Sun Technique Easy Prey Ember Shot Enthusiastic Study Escape Detection Exclude Expedite Fateful Absence Fend Off Feral Instinct Fevered Strength Fire Prophecy Fires of Victory Fists of Flame Flare Flash Foliage Fleeting Distraction Footbottom Feast Force Away Formation

WotC really went off the rails with OTJ's pack complexity, so in case you want all the details: You can find a card from The List in 1 out of 5 Play Boosters (that's to say, 20% of the time)
What's new in this set is that not all adventurer cards are creature cards