Skullclamp is one of the easiest ways to continue getting cards in your hand
destroy that card on the field, and if you do, add that other monster to your hand

Biowaste Blob Bitter Ordeal Blade of Selves Blade of Shared Souls Blazing Firesinger Bloodforged Battle-Axe Bloodthirsty Adversary Blue Mage's Cane Blue Ribbon Blue Sun's Twilight Body Double Bonus Round Brain Freeze Bramble Sovereign Brass Knuckles Breeches, the Blastmaker Brenard, Ginger Sculptor Briarblade Adept Brigid's Command Broodbirth Viper Brudiclad, Telchor Engineer Burn Trail Bushy Bodyguard Bygone Marvels Cabaretti Confluence Cackling Counterpart Cadric, Soul Kindler Calamity, Galloping Inferno Calix, Guided by Fate Call of the Nightwing Caller of the Pack Caller of the Untamed Callidus Assassin Campus Composer Capricious Hellraiser Caretaker's Talent Case of the Shifting Visage Caught in a Parallel Universe Cemetery Puca Cephalid Facetaker Chain Lightning Chain Stasis Chain of Acid Chain of Plasma Chain of Silence Chain of Smog Chain of Vapor Chameleon, Master of Disguise Champion of Wits Chancellor of Tales Chandra's Regulator Chandra, Flameshaper Chandra, Hope's Beacon Chandra, Pyromaster Chandra, the Firebrand Changing Loyalty Chatterstorm Cheerful Osteomancer Chef's Kiss Choreographed Sparks Chrome Dome City of Death Clever Impersonator Clever Lumimancer Clone Clone Legion Cloven Casting Coastline Marauders Cogwork Assembler Coiling Rebirth Colorstorm Stallion Complete the Circuit

It also has a super niche combo angle: With Mechanized Production on Ugin's Nexus, the upkeep triggers can loop into infinite turns by making a Nexus copy, using the legend rule to cash it in for an extra turn, then phasing the setup out and back in so it repeats
Promo 70,000pts - Umbreon Holo - 2005 Pokemon Japanese Play Sold: 2021 - Price: $78,000 This beautiful card portrays Umbreon enveloped in darkness, with its intense yellow eyes shining brightly like beacons