Karn, Silver Golem [Arena League 1999] Chandra Set: World Magic Cup Qualifiers

Set: World Magic Cup Qualifiers Type: Instant Rarity: Rare Cost: {B}{G} This spell can't be countered

Set: Antiquities Type: Artifact Rarity: Uncommon Cost: {2} {2}

then that player shuffles their hand into their library

you might as well trade it for something else

If that mana is spent on an instant or sorcery spell

Karn, Silver Golem [Arena League 1999] Chandra Set: World Magic Cup QualifiersSet: 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.