You can use this effect of "Number 80: Rhapsody in Berserk" up to twice per turn

Synthoids Aang and Katara Aang and La, Ocean's Fury Aang, A Lot to Learn Aang, Air Nomad Aang, Airbending Master Aang, Destined Savior Aang, Master of Elements Aang, Swift Savior Aang, at the Crossroads Aang, the Last Airbender Aarakocra Sneak Aardvark Sloth Aatchik, Emerald Radian Abaddon the Despoiler Abattoir Ghoul Abbey Gargoyles Abbey Griffin Abbey Matron Abbot of Keral Keep Abdel Adrian, Gorion's Ward Aberrant Aberrant Manawurm Aberrant Mind Sorcerer Aberrant Researcher Abhorrent Oculus Abhorrent Overlord Abigale, Eloquent First-Year Abigale, Poet Laureate Aboleth Spawn Abolisher of Bloodlines Abominable Treefolk Abomination Abomination of Gudul Abomination of Llanowar Abomination, Irradiated Brute Abomination, Terrifying Titan Abomination, World Ravager Aboroth Aboshan, Cephalid Emperor Absolute Virtue Absolver Thrull Absolving Lammasu Absorbing Man Absorbing Man and Titania Abstract Iguanart Abstract Paintmage Abstruse Archaic Abu Ja'far Abuelo, Ancestral Echo Abuna Acolyte Abundant Maw Abyssal Gatekeeper Abyssal Gorestalker Abyssal Harvester Abyssal Horror Abyssal Hunter Abyssal Nightstalker Abyssal Nocturnus Abyssal Persecutor Abyssal Specter Abzan Battle Priest Abzan Beastmaster Abzan Devotee Abzan Falconer Abzan Guide Abzan Kin-Guard Abzan Skycaptain

on heads, the attack is successful, but on a result of tails, the attack is unsuccessful and the Pokmon deals 30 HP of damage to itself
Commander-ready format (EDH) fully playable 100-card setup
His mother explained to me the concept and showed my how to tell 1st Edition cards from regular prints