To add +1/+1 counters is a primary way to modify creatures
Cheating creatures into play from the graveyard, locking your opponents out of the game with a convoluted combination of prison cards, or going infinite with a few key pieces are just some examples
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Includes members/support for the "Alien", "Ancient Gear", "Artifact", "Blackwing", "Bujin", "Buster Blader", "Charmer", "Chaos", "Crystron", "Cyber", "Cyber Dragon", "Cynet", "Cubic", "D/D", "D/D/D", "Darklord", "Destiny HERO", "Destruction Sword", "Edge Imp", "Endymion", "Evolution Pill", "Familiar-Possessed", "Fluffal", "Frog", "Frightfur", "Fusion", "Harpie", "HERO", "Hole", "Gusto", "Madolche", "Magical Musket", "Malefic", "Mayakashi", "Mecha Phantom Beast", "Melodious", "Number", "Ojama", "Orcust", "Paleozoic", "Parshath", "Phantom Beast", "Polymerization", "Predaplant", "PSY-Frame", "Raidraptor", "Reptilianne", "roid", "Rose", "Rose Dragon", "Salamangreat", "Scrap", "Secret Six Samurai", "Simorgh", "Six Samurai", "Sky Striker", "Sky Striker Ace", "Speedroid", "Tenyi", "Traptrix", "Vehicroid", "Watt", "Witchcrafter", and "World Legacy" archetypes, as well as the Fairy Tale, Herald, Vanity's, Wight and Xtra HERO series

The greatest supply on a card is almost always 2-4 months after release, when the next big set comes out
This four-mana artifact has a few interesting effects that can help players end the game quickly, but at a cost