Karn, Silver Golem [Arena League 1999] Countdown Calendar Promos if the number of counters

if the number of counters is equal to or greater than the number of required Tribute(s)

when a monster effect is activated on your opponent's side of the field: You can detach 1 Xyz Material from this card

Set: Dark Revelation Volume 4 Card type: Fusion/Effect Monster Rarity: Rare Attack: 3000 Defense: 2800 "VW-Tiger Catapult" + "XYZ-Dragon Cannon" This card can only be Special Summoned from your Extra Deck by removing from play the above cards you control

Set: Diamond & Pearl: Mysterious Treasures Type: Colorless Rarity: Uncommon Retreat cost: Colorless

its original ATK is halved until the end of the Damage Step

Karn, Silver Golem [Arena League 1999] Countdown Calendar Promos if the number of countersSet: Arena League 1999 Type: Legendary Artifact Creature Golem Rarity: Rare Cost: {5} Whenever Karn, Silver Golem blocks or becomes blocked, it gets 4 +4 until end of turn. {1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.