Blinkmoth Urn

Karn's power and toughness are each equal to the greatest mana value among artifacts you control.

At the beginning of your upkeep, add for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.

Each player skips their untap step.

At the beginning of each player's upkeep, that player simultaneously untaps each tapped artifact, creature, and land they control and taps each untapped artifact, creature, and land they control.

Whenever this artifact or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

At the beginning of each player's end step, if that player has 5 or less life, this artifact deals 2 damage to that player.

: Add .

, , Sacrifice this artifact: Exile any number of target players' graveyards. Draw a card.

When The Mightstone and Weakstone enters, choose one —

• Draw two cards.

• Target creature gets -5/-5 until end of turn.

: Add . This mana can't be spent to cast nonartifact spells.

(Melds with Urza, Lord Protector.)