Memory Jar

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

Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. 2, T: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

2, T, Sacrifice this artifact: Search target player's library for three cards and exile them. Then that player shuffles.

At the beginning of your upkeep, you may put a charge counter on this artifact. T: You may put a creature card with mana value equal to the number of charge counters on this artifact from your hand onto the battlefield.

T: Add CC.

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.

Sacrifice a land: You gain 2 life.

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