Glissa is infamous for creating loops at the kitchen table
Number 32: Shark Drake X WATER Rank 4 [ Sea Serpent / XyzEffect ] ATK 2800 DEF 2100 3 Level 4 monsters Once per turn, when this attacking card destroys an opponent's monster by battle and sends it to the GY: You can detach 1 material from this card
But it's not just the scalpers who are using online bots that are the problem - people seem to be buying out entire stocks at brick and mortar stores with the intention of reselling
These cards are similar to hand traps in Yu-Gi-Oh!, or instants in Magic: The Gathering
It's easy to disrupt, and you do need a creature worth pointing at (big, and ideally with keywords like lifelink or deathtouch)
Abrupt Decay Advent of the Wurm Aethermage's Touch Arid Mesa Basilisk Collar Blade Splicer Blood Moon Boros Reckoner Broodmate Dragon Cackling Counterpart Call of the Herd Cruel Ultimatum Cyclonic Rift Damnation Damping Matrix Deadeye Navigator Death's Shadow Desecration Demon Evil Twin Extractor Demon Falkenrath Aristocrat Fiery Justice Gifts Ungiven Goblin Guide Grafdigger's Cage Hellrider Marsh Flats Mind Shatter Misty Rainforest Mizzium Mortars Niv-Mizzet, Dracogenius Obzedat, Ghost Council Phantasmal Image Primal Command Pyromancer Ascension Ranger of Eos Restoration Angel Scalding Tarn Scavenging Ooze Sever the Bloodline Simic Sky Swallower Stoic Angel Stony Silence Summoning Trap Sance Terminus Thragtusk Ulvenwald Tracker Venser, Shaper Savant Verdant Catacombs Wort, the Raidmother Zealous Conscripts Zur the Enchanter