Whenever Karn 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.
Whenever a creature dies, if another creature is on the battlefield, return the first card to the battlefield under its owner's control at the beginning of the next end step.
At the beginning of your upkeep, you may put a petal counter on this artifact. {T}, Sacrifice this artifact: Add X mana of any one color, where X is the number of petal counters on this artifact.
When a spell or ability an opponent controls causes you to discard this card, create four 1/1 colorless Gnome artifact creature tokens. {4}, {T}: Create a 1/1 colorless Gnome artifact creature token.
At the beginning of each player's upkeep, return to its owner's hand each creature that player controls with power greater than the number of cards in their hand.
As this artifact enters, pay any amount of life. {4}, {T}: Create an X/X black Phyrexian Minion creature token, where X is the life paid as this artifact entered.
At the beginning of your upkeep, this artifact deals 2 damage to the creature with the least toughness. If two or more creatures are tied for least toughness, you choose one of them.
At the beginning of your upkeep, you may put a soot counter on this artifact. At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact.
{5}, {T}: Shuffle your library, then reveal the top card. Until end of turn, for as long as that card remains on top of your library, play with the top card of your library revealed and you may play that card without paying its mana cost.