Isochron Scepter

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

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.

T, Sacrifice this artifact: Each player exiles all cards from their hand face down and draws seven cards. At the beginning of the next end step, each player discards their hand and returns to their hand each card they exiled this way.