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As this artifact enters, choose an opponent.

At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is the number of cards in their hand minus 4.

At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4.

{2 generic}2, {tap}↷, Sacrifice this artifact: Search target player's library for three cards and exile them. Then that player shuffles.

Whenever Karn blocks or becomes blocked, it gets -4/+4 until end of turn.

{1 generic}1: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.

At the beginning of your upkeep, sacrifice this creature unless you discard a card.

{2 generic}2: This creature deals 1 damage to target creature.

{2 generic}2: Regenerate this creature.

Whenever you cast an instant or sorcery spell, you may pay {3 generic}3. If you do, copy that spell. You may choose new targets for the copy.

If this artifact would enter, you may discard a land card instead. If you do, put this artifact onto the battlefield. If you don't, put it into its owner's graveyard.

{tap}↷: Add one mana of any color.

This artifact enters tapped.

{1 generic}1, {tap}↷: Destroy all artifacts, creatures, and enchantments.

Sacrifice a land: You gain 2 life.